49 results on '"Xia, Zhi-gui"'
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2. Competency of malaria laboratory diagnosis at national and provincial levels at the beginning of malaria post-elimination phase, China
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Yan, He, Li, Mei, Xia, Zhi-gui, and Yin, Jian-hai
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- 2024
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3. Epidemiological characteristics of Plasmodium malariae malaria in China: a malaria that should not be neglected post elimination
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Zhang, Li, Yi, Bo-Yu, Zhou, Shui-Sen, Xia, Zhi-Gui, and Yin, Jian-Hai
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- 2023
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4. Insights into the elimination of vivax malaria in China
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Huang, Fang, Zhang, Li, and Xia, Zhi-Gui
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- 2023
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5. Epidemiologic Analysis of Efforts to Achieve and Sustain Malaria Elimination along the China-Myanmar Border
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Huang, Fang, Zhang, Li, Tu, Hong, Cui, Yan-Wen, Zhou, Shui-Sen, Xia, Zhi-Gui, and Zhou, Hong-Ning
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Sentinel health events -- Methods ,Malaria -- Control -- Risk factors -- Statistics ,Health - Abstract
In 2010, China issued the National Malaria Elimination Action Plan (2010-2020), with the goal of eliminating malaria nationwide by 2020 (1). Malaria cases in China subsequently decreased dramatically, and no [...]
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- 2021
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6. A retrospective analysis of malaria epidemiological characteristics in Yingjiang County on the China–Myanmar border
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Huang, Fang, Li, Shi-Gang, Tian, Peng, Guo, Xiang-Rui, Xia, Zhi-Gui, Zhou, Shui-Sen, Zhou, Hong-Ning, and Zhou, Xiao-Nong
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- 2021
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7. Molecular surveillance of pfcrt, pfmdr1 and pfk13-propeller mutations in Plasmodium falciparum isolates imported from Africa to China
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Huang, Fang, Yan, He, Xue, Jing-Bo, Cui, Yan-Wen, Zhou, Shui-Sen, Xia, Zhi-Gui, Abeyasinghe, Rabindra, Ringwald, Pascal, and Zhou, Xiao-Nong
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- 2021
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8. From control to elimination: a spatial-temporal analysis of malaria along the China-Myanmar border
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Huang, Fang, Zhang, Li, Xue, Jing-Bo, Zhou, Hong-Ning, Thi, Aung, Zhang, Jun, Zhou, Shui-Sen, Xia, Zhi-Gui, and Zhou, Xiao-Nong
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- 2020
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9. Ready for malaria elimination: zero indigenous case reported in the People’s Republic of China
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Feng, Jun, Zhang, Li, Huang, Fang, Yin, Jian-Hai, Tu, Hong, Xia, Zhi-Gui, Zhou, Shui-Sen, Xiao, Ning, and Zhou, Xiao-Nong
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- 2018
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10. Mobile population dynamics and malaria vulnerability: a modelling study in the China-Myanmar border region of Yunnan Province, China
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Chen, Tian-Mu, Zhang, Shao-Sen, Feng, Jun, Xia, Zhi-Gui, Luo, Chun-Hai, Zeng, Xu-Can, Guo, Xiang-Rui, Lin, Zu-Rui, Zhou, Hong-Ning, and Zhou, Shui-Sen
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- 2018
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11. Establishing and applying an adaptive strategy and approach to eliminating malaria: practice and lessons learnt from China from 2011 to 2020.
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Huang, Fang, Feng, Xin-Yu, Zhou, Shui-Sen, Tang, Lin-Hua, and Xia, Zhi-Gui
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- 2022
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12. Chapter Two - The contributions and achievements on malaria control and forthcoming elimination in China over the past 70 years by NIPD-CTDR
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Feng, Xinyu, Xia, Zhi-Gui, Feng, Jun, Zhang, Li, Yan, He, Tang, Linhua, Zhou, Xiao-Nong, and Zhou, Shuisen
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- 2020
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13. Chapter Thirteen - Contribution of NIPD-CTDR to the parasitic diseases control and elimination in China: Memory of the 70th anniversary for NIPD-CTDR
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Xiao, Ning, Li, Shi-Zhu, Qian, Men-Bao, Xia, Zhi-Gui, Yu, Qing, Liu, Qin, Lv, Shan, and Zhou, Xiao-Nong
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- 2020
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14. Imported malaria in China, 2012
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Feng, Jun, Yan, He, Feng, Xin-yu, Zhang, Li, Li, Mei, Xia, Zhi-gui, and Xiao, Ning
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Malaria -- Distribution -- Prevention -- Reports ,Disease transmission -- Prevention -- Reports ,Company distribution practices ,Health - Abstract
To the Editor: Imported malaria has become a major public health challenge in China. Despite an 89.8% decrease in total cases from 2008 (26,873) through 2012 (2,729), the proportion of [...]
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- 2014
15. Prevalence of Clinical and Subclinical Plasmodium falciparum and Plasmodium vivax Malaria in Two Remote Rural Communities on the Myanmar–China Border
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Huang, Fang, Takala-Harrison, Shannon, Liu, Hui, Xu, Jian-Wei, Yang, Heng-Lin, Adams, Matthew, Shrestha, Biraj, Mbambo, Gillian, Rybock, Demian, Zhou, Shui-Sen, Xia, Zhi-Gui, Zhou, Xiao-Nong, Plowe, Christopher V., and Nyunt, Myaing M.
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Adult ,Aged, 80 and over ,Male ,Rural Population ,China ,Adolescent ,Diagnostic Tests, Routine ,Plasmodium falciparum ,Infant ,Articles ,Myanmar ,Middle Aged ,Young Adult ,Cross-Sectional Studies ,Child, Preschool ,parasitic diseases ,Malaria, Vivax ,Prevalence ,Humans ,Female ,Malaria, Falciparum ,Child ,Plasmodium vivax ,Asymptomatic Infections ,Aged - Abstract
Malaria infections may be symptomatic, leading to treatment, or “asymptomatic,” typically detected through active surveillance, and not leading to treatment. Malaria elimination may require purging both types of infection. Using detection methods with different sensitivities, we conducted a cross-sectional study in two rural communities located along the border between China’s Yunnan Province and Myanmar’s Shan and Kachin States, to estimate the prevalence of asymptomatic and symptomatic malaria. In Mong Pawk, all infections detected were asymptomatic, and the prevalence of Plasmodium falciparum was 0.3%, 4.3%, 4.0%, and 7.8% by light microscopy, rapid diagnostic test (RDT), conventional polymerase chain reaction (cPCR), and multiplexed real-time PCR (RT-PCR), respectively, and Plasmodium vivax prevalence was 0% by all detection methods. In Laiza, of 385 asymptomatic participants, 2.3%, 4.4%, and 12.2% were positive for P. vivax by microscopy, cPCR, and RT-PCR, respectively, and 2.3% were P. falciparum-positive only by RT-PCR. Of 34 symptomatic participants in Laiza, 32.4% were P. vivax-positive by all detection methods. Factors associated with infection included gender (males higher than females, P = 0.014), and young age group (5–17 age group compared with others, P = 0.0024). Although the sensitivity of microscopy was adequate to detect symptomatic infections, it missed the vast majority (86.5%) of asymptomatic infections. Although molecular detection methods had no advantage over standard microscopy or RDT diagnosis for clinically apparent infections, malaria elimination along the Myanmar–China border will likely require highly sensitive surveillance tools to identify asymptomatic infections and guide targeted screen-and-treat interventions.
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- 2017
16. Epidemiologic Analysis of Efforts to Achieve and Sustain Malaria Elimination along the China-Myanmar Border.
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Fang Huang, Li Zhang, Hong Tu, Yan-Wen Cui, Shui-Sen Zhou, Zhi-Gui Xia, Hong-Ning Zhou, Huang, Fang, Zhang, Li, Tu, Hong, Cui, Yan-Wen, Zhou, Shui-Sen, Xia, Zhi-Gui, and Zhou, Hong-Ning
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MALARIA ,COUNTIES ,MALARIA prevention ,RESEARCH ,RESEARCH methodology ,MEDICAL cooperation ,EVALUATION research ,COMPARATIVE studies - Abstract
Malaria cases have dramatically declined in China along the Myanmar border, attributed mainly to adoption of the 1-3-7 surveillance and response approach. No indigenous cases have been reported in China since 2017. Counties in the middle and southern part of the border area have a higher risk for malaria importation and reestablishment after elimination. [ABSTRACT FROM AUTHOR]
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- 2021
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17. High Frequency Mutations in pfdhfr and pfdhps of Plasmodium falciparum in Response to Sulfadoxine-Pyrimethamine: A Cross-Sectional Survey in Returning Chinese Migrants From Africa.
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Yan, He, Feng, Jun, Yin, Jian-hai, Huang, Fang, Kong, Xiang-li, Lin, Kang-ming, Zhang, Tao, Feng, Xin-yu, Zhou, Shui-sen, Cao, Jian-ping, and Xia, Zhi-gui
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PLASMODIUM falciparum ,SINGLE nucleotide polymorphisms ,RETURN migrants ,TETRAHYDROFOLATE dehydrogenase ,MALARIA ,MIGRANT labor - Abstract
Background: Sulfadoxine-pyrimethamine (SP) is recommended for intermittent preventive treatment in Africa against Plasmodium falciparum infection. However, increasing SP resistance (SPR) of P. falciparum affects the therapeutic efficacy of SP, and pfdhfr (encoding dihydrofolate reductase) and pfdhps (encoding dihydropteroate synthase) genes are widely used as molecular markers for SPR surveillance. In the present study, we analyzed single nucleotide polymorphisms (SNPs) of pfdhfr and pfdhps in P. falciparum isolated from infected Chinese migrant workers returning from Africa. Methods: In total, 159 blood samples from P. falciparum -infected workers who had returned from Africa to Anhui, Shangdong, and Guangxi provinces were successfully detected and analyzed from 2017 to 2019. The SNPs in pfdhfr and pfdhps were analyzed using nested PCR. The genotypes and linkage disequilibrium (LD) were analyzed using Haploview. Results: High frequencies of the Asn51Ile (N51I), Cys59Arg(C59R), and Ser108Asn(S108N) mutant alleles were observed, with mutation frequencies of 97.60, 87.43, and 97.01% in pfdhfr , respectively. A triple mutation (IRN) in pfdhfr was the most prevalent haplotype (86.83%). Six point mutations were detected in pfdhps DNA fragment, Ile431Val (I431V), Ser436Ala (S436A), Ala437Gly (A437G), Lys540Glu(K540E), Ala581Gly(A581G), Ala613Ser(A613S). The pfdhps K540E (27.67%) was the most predominant allele, followed by S436A (27.04%), and a single mutant haplotype (SGKAA; 62.66%) was predominant in pfdhps. In total, 5 haplotypes of the pfdhfr gene and 13 haplotypes of the pfdhps gene were identified. A total of 130 isolates with 12 unique haplotypes were found in the pfdhfr-pfdhps combined haplotypes, most of them (n = 85, 65.38%) carried quadruple allele combinations (CIRNI-SGKAA). Conclusion: A high prevalence of point mutations in the pfdhfr and pfdhps genes of P. falciparum isolates was detected among Chinese migrant workers returning from Africa. Therefore, continuous in vitro molecular monitoring of Sulfadoxine-Pyrimethemine combined in vivo therapeutic monitoring of artemisinin combination therapy (ACT) efficacy and additional control efforts among migrant workers are urgently needed. [ABSTRACT FROM AUTHOR]
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- 2021
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18. Genomic Epidemiology of Antimalarial Drug Resistance in Plasmodium falciparum in Southern China.
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Huang, Fang, Jacob, Christopher G., Takala-Harrison, Shannon, Adams, Matthew, Yang, Heng-Lin, Liu, Hui, Xia, Zhi-Gui, Zhou, Shui-Sen, Tang, Lin-Hua, and Plowe, Christopher V.
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PLASMODIUM falciparum ,DRUG resistance ,PHARMACOGENOMICS ,MALARIA ,SINGLE nucleotide polymorphisms ,PRINCIPAL components analysis ,LOCUS (Genetics) ,MOLECULAR epidemiology - Abstract
Emerging artemisinin resistance in Southeast Asia poses a significant risk to malaria control and eradication goals, including China's plan to eliminate malaria nationwide by 2020. Plasmodium falciparum was endemic in China, especially in Southern China. Parasites from this region have shown decreased susceptibility to artemisinin and delayed parasite clearance after artemisinin treatment. Understanding the genetic basis of artemisinin resistance and identifying specific genetic loci associated with this phenotype is crucial for surveillance and containment of resistance. In this study, parasites were collected from clinical patients from Yunnan province and Hainan island. The parasites were genotyped using a P. falciparum -specific single nucleotide polymorphism (SNP) microarray. The SNP profiles examined included a total of 27 validated and candidate molecular markers of drug resistance. The structure of the parasite population was evaluated by principal component analysis by using the EIGENSOFT program, and ADMIXTURE was used to calculate maximum likelihood estimates for the substructure analysis. Parasites showed a high prevalence of resistance haplotypes of pfdhfr and pfdhps and moderate prevalence of pfcrt. There was no mutation identified on pfmdr1. Candidate SNPs on chromosomes 10, 13, and 14 that were associated with delayed parasite clearance showed a low prevalence of mutants. Parasites from Southern China were clustered and separated from those from Southeast Asia. Parasites from Yunnan province were substructured from parasites from Hainan island. This study provides evidence for a genomic population with drug resistance in Southern China and also illustrates the utility of SNP microarrays for large-scale parasite molecular epidemiology. [ABSTRACT FROM AUTHOR]
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- 2021
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19. China–Africa Cooperation Initiatives in Malaria Control and Elimination
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Xia, Zhi-Gui, Wang, Ru-Bo, Wang, Duo-Quan, Feng, Jun, Zheng, Qi, Deng, Chang-Sheng, Abdulla, Salim, Guan, Ya-Yi, Ding, Wei, Yao, Jia-Wen, Qian, Ying-Jun, Bosman, Andrea, Newman, Robert David, Ernest, Tambo, O’leary, Michael, and Xiao, Ning
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China ,Cooperation ,National Health Programs ,Elimination ,International Cooperation ,Research ,parasitic diseases ,Africa ,Control ,Humans ,Disease Eradication ,Article ,Malaria - Abstract
Malaria has affected human health globally with a significant burden of disease, and also has impeded social and economic development in the areas where it is present. In Africa, many countries have faced serious challenges in controlling malaria, in part due to major limitations in public health systems and primary health care infrastructure. Although China is a developing country, a set of control strategies and measures in different local settings have been implemented successfully by the National Malaria Control Programme over the last 60 years, with a low cost of investment. It is expected that Chinese experience may benefit malaria control in Africa. This review will address the importance and possibility of China-Africa collaboration in control of malaria in targeted African countries, as well as how to proceed toward the goal of elimination where this is technically feasible.
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- 2014
20. Chapter Nine - Preparedness for Malaria Resurgence in China: Case Study on Imported Cases in 2000–2012
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Feng, Jun, Xia, Zhi-Gui, Vong, Sirenda, Yang, Wei-Zhong, Zhou, Shui-Sen, and Xiao, Ning
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- 2014
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21. Chapter Eleven - Transition from Control to Elimination: Impact of the 10-Year Global Fund Project on Malaria Control and Elimination in China
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Wang, Ru-Bo, Zhang, Qing-Feng, Zheng, Bin, Xia, Zhi-Gui, Zhou, Shui-Sen, Tang, Lin-Hua, Gao, Qi, Wang, Li-Ying, and Wang, Rong-Rong
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- 2014
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22. Chapter Ten - Preparation for Malaria Resurgence in China: Approach in Risk Assessment and Rapid Response
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Qian, Ying-Jun, Zhang, Li, Xia, Zhi-Gui, Vong, Sirenda, Yang, Wei-Zhong, Wang, Duo-Quan, and Xiao, Ning
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- 2014
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23. Chapter Twelve - China–Africa Cooperation Initiatives in Malaria Control and Elimination
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Xia, Zhi-Gui, Wang, Ru-Bo, Wang, Duo-Quan, Feng, Jun, Zheng, Qi, Deng, Chang-Sheng, Abdulla, Salim, Guan, Ya-Yi, Ding, Wei, Yao, Jia-Wen, Qian, Ying-Jun, Bosman, Andrea, Newman, Robert David, Ernest, Tambo, O’leary, Michael, and Xiao, Ning
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- 2014
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24. Chapter Four - Surveillance and Response to Drive the National Malaria Elimination Program
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Feng, Xin-Yu, Xia, Zhi-Gui, Vong, Sirenda, Yang, Wei-Zhong, and Zhou, Shui-Sen
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- 2014
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25. Chapter Three - Lessons from Malaria Control to Elimination: Case Study in Hainan and Yunnan Provinces
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Xia, Zhi-Gui, Zhang, Li, Feng, Jun, Li, Mei, Feng, Xin-Yu, Tang, Lin-Hua, Wang, Shan-Qing, Yang, Heng-Lin, Gao, Qi, Kramer, Randall, Ernest, Tambo, Yap, Peiling, and Zhou, Xiao-Nong
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- 2014
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26. Chapter One - Historical Patterns of Malaria Transmission in China
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Yin, Jian-Hai, Zhou, Shui-Sen, Xia, Zhi-Gui, Wang, Ru-Bo, Qian, Ying-Jun, Yang, Wei-Zhong, and Zhou, Xiao-Nong
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- 2014
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27. Chapter Two - Feasibility and Roadmap Analysis for Malaria Elimination in China
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Zhou, Xiao-Nong, Xia, Zhi-Gui, Wang, Ru-Bo, Qian, Ying-Jun, Zhou, Shui-Sen, Utzinger, Jürg, Tanner, Marcel, Kramer, Randall, and Yang, Wei-Zhong
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- 2014
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28. Imported malaria from land bordering countries in China: A challenge in preventing the reestablishment of malaria transmission.
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Yin, Jian-hai, Zhang, Li, Yi, Bo-yu, Zhou, Shui-sen, and Xia, Zhi-gui
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No indigenous malaria cases have been reported since 2017 in China, but a large number of imported cases are still reported every year, including those from the land bordering countries. To characterize their epidemiological profiles will provide evidence for the development of appropriate strategies to effectively address the challenges of border malaria in the post-elimination phase. Individual-level data of imported malaria cases from the land bordering countries were collected from 2017 to 2021 in China via the web-based surveillance systems, and analyzed by SPSS, ArcGIS and WPS software, to explore their epidemiological profiles. A total of 1170 malaria cases imported into China from six of the fourteen land bordering countries were reported between 2017 and 2021 with a decline trend. Overall, cases were widely distributed in 31–97 counties from 11 to 21 provinces but mainly in Yunnan. Moreover, these imported cases were mainly infected with P. vivax (94.8%), and a total of 68 recurrent cases were reported in 6–14 counties from 4 to 8 provinces. In addition, nearly 57.1% of the total reported cases could seek healthcare within 2 days of getting sick, and 71.3% of the reported cases could be confirmed as malaria on the day they sought medical care. China still needs to attach great importance to the risk and challenge of the imported malaria from bordering countries particularly from Myanmar in preventing reestablishment of malaria transmission in the post-elimination phase. It is necessary not only to strengthen collaboration and cooperation with the bordering countries, but also coordinate multiple departments at home to improve malaria surveillance and response system and prevent the reestablishment of malaria transmission in China. [ABSTRACT FROM AUTHOR]
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- 2023
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29. Changing Malaria Transmission and Implications in China towards National Malaria Elimination Programme between 2010 and 2012.
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Yin, Jian-hai, Yang, Man-ni, Zhou, Shui-sen, Wang, Yi, Feng, Jun, and Xia, Zhi-gui
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MALARIA transmission ,MALARIA treatment ,MEDICAL databases ,HEALTH surveys ,COMMUNICABLE diseases - Abstract
Background:Towards the implementation of national malaria elimination programme in China since 2010, the epidemiology of malaria has changed dramatically, and the lowest malaria burden was achieved yearly. It is time to analyze the changes of malaria situation based on surveillance data from 2010 to 2012 to reconsider the strategies for malaria elimination. Methods and Principal findings:Malaria epidemiological data was extracted from the provincial annual reports in China between 2010 and 2012. The trends of the general, autochthonous and imported malaria were analyzed, and epidemic areas were reclassified according to Action Plan of China Malaria Elimination (2010-2020). As a result, there reported 2743 malaria cases with a continued decline in 2012, and around 7% autochthonous malaria cases accounted. Three hundred and fifty-three individual counties from 19 provincial regions had autochthonous malaria between 2010 and 2012, and only one county was reclassified into Type I (local infections detected in 3 consecutive years and the annual incidences ≥ 1/10,000) again. However, the imported malaria cases reported of each year were widespread, and 598 counties in 29 provinces were suffered in 2012. Conclusions/Significance:Malaria was reduced significantly from 2010 to 2012 in China, and malaria importation became an increasing challenge. It is necessary to adjust or update the interventions for subsequent malaria elimination planning and resource allocation. [ABSTRACT FROM AUTHOR]
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- 2013
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30. Serological surveillance on potential Plasmodium vivax exposure risk in a post-elimination setting.
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Huang F, Cui Y, Huang Z, Wang S, Li S, Guo X, Guo X, and Xia ZG
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- Humans, Plasmodium vivax, Plasmodium falciparum, Cross-Sectional Studies, Seroepidemiologic Studies, Antibodies, Protozoan, Immunoglobulin G, Malaria, Falciparum, Malaria, Vivax epidemiology, Malaria
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China was declared malaria free in June of 2021. In the post-elimination setting, vigilant surveillance is essential to sustain malaria free status. Serological surveillance has been recognized as an efficient tool for assessing the immunity levels and exposure risk in a population. In this study, a cross-sectional serological survey was conducted in Yingjiang County, China, in August-September, 2021. The study sites were villages along the borders with Myanmar, which have no local transmission since the last indigenous case registered in 2016. A total of 923 participants from six villages were enrolled. The majority was aged > 36 years (56.12%) and 12.46% (115/923) participants had experienced malaria infection at least once. A magnetic- bead-based assay was used to test antibodies against Plasmodium vivax antigen PvMSP-1
19 to evaluate the prevalence of antibody positive subjects. A reversible catalytic model was used to assess the risk of exposure. The prevalence of anti-PvMSP-119 IgG was 12.84% [95% confidence interval (CI): 9.22%-16.47%], 13.93% (95% CI: 10.11%-17.74%), and 3.57% (95% CI: 1.40%-5.75%) in three different line-of-defense areas, which differed significantly ( P < 0.0001). The prevalence of anti-PvMSP-119 IgG increased with age and no statistically significant difference was detected between the sexes. The reversible catalytic model indicated that the seropositive conversion rate and seronegative reversion rate were 0.0042, 0.0034, 0.0032 and 0.0024, 0.0004, 0.0065 in the first-, second-line-of-defense area and total areas, respectively, and the fitted value did not differ significantly from the observed value ( P > 0.1). Although this study found the prevalence of antibody-positive subjects and the seroconversion rate in this post-elimination setting were lower than that in transmission setting, the population still had an exposure risk. Serological surveillance should be considered in post-elimination settings to provide valuable information with which to evaluate the risk of malaria re-establishment., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Huang, Cui, Huang, Wang, Li, Guo, Guo and Xia.)- Published
- 2023
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31. Evolution of anti-malaria policies and measures in P.R. China for achieving and sustaining malaria-free.
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Yin JH, Zhang L, Feng XY, and Xia ZG
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- Infant, Newborn, Humans, Disease Eradication, China epidemiology, Antimalarials therapeutic use, Malaria epidemiology, Malaria prevention & control, Communicable Diseases
- Abstract
Malaria is a major public health threat worldwide, and it was also widely prevalent in the history in China, seriously endangering people's health and affecting socioeconomic development. China was certified malaria elimination in 2021 with unremitting efforts since the founding of the People's Republic of China in 1949. This great achievement has been another milestone in the fight against major infectious diseases following the elimination of smallpox, poliomyelitis, leprosy, filariasis, neonatal tetanus and blinding trachoma in China. This paper briefly introduces the malaria burden dynamics and the corresponding malaria transmission risk stratificantions, as well as systematically reviews the evolution of anti-malaria policies and measures from severe epidemic to elimination in China. Meanwhile, five key lessons in malaria control and elimination in China are also briefly summarized. All of the above provide evidences for promoting global malaria eradication and preventing reestablishment of malaria transmission, finally benefit all individuals still suffering from the scourge of malaria., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Yin, Zhang, Feng and Xia.)
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- 2023
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32. Prediction of the Risk Distributions for Anopheles sinensis, a Vector for Malaria in Shanghai, China.
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Tong YX, Xia ZG, Wang QY, Xu N, Jiang HL, Wang ZZ, Xiong Y, Yin JF, Huang JH, Jiang F, Chen Y, Jiang QW, and Zhou YB
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- Animals, Humans, Mosquito Vectors parasitology, China epidemiology, Anopheles parasitology, Malaria epidemiology, Plasmodium
- Abstract
Malaria is a parasitic disease caused by Plasmodium, and Anopheles sinensis is a vector of malaria. Although malaria is no longer indigenous to China, a high risk remains for local transmission of imported malaria. This study aimed to identify the risk distribution of vector An. sinensis and malaria transmission. Using data collected from routine monitoring in Shanghai from 2010 to 2020, online databases for An. sinensis and malaria, and environmental variables including climate, geography, vegetation, and hosts, we constructed 10 algorithms and developed ensemble models. The ensemble models combining multiple algorithms (An. sinensis: area under the curve [AUC] = 0.981, kappa = 0.920; malaria: AUC = 0.959, kappa = 0.800), with the best out-of-sample performance, were used to identify important environmental predictors for the risk distributions of An. sinensis and malaria transmission. For An. sinensis, the most important predictor in the ensemble model was moisture index, which reflected degree of wetness; the risk of An. sinensis decreased with higher degrees of wetness. For malaria transmission, the most important predictor in the ensemble model was the normalized differential vegetation index, which reflected vegetation cover; the risk of malaria transmission decreased with more vegetation cover. Risk levels for An. sinensis and malaria transmission for each district of Shanghai were presented; however, there was a mismatch between the risk classification maps of An. sinensis and malaria transmission. Facing the challenge of malaria transmission in Shanghai, in addition to precise An. sinensis monitoring in risk areas of malaria transmission, malaria surveillance should occur even in low-risk areas for An. sinensis.
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- 2023
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33. The contributions and achievements on malaria control and forthcoming elimination in China over the past 70 years by NIPD-CTDR.
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Feng X, Xia ZG, Feng J, Zhang L, Yan H, Tang L, Zhou XN, and Zhou S
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- Animals, China epidemiology, Disease Eradication, Drug Development, Drug Resistance, Humans, Insecticides, Academies and Institutes, Government Programs, Malaria drug therapy, Malaria epidemiology, Malaria prevention & control, National Health Programs
- Abstract
Although the past decades have seen a remarkable decrease in malaria-caused mortality and morbidity, the infection remains a significant challenge to global health. In the battle against malaria, China has gained notable feat and achievement since the 1940s through the efforts of several generations. Notably, China has not recorded a single indigenous malaria case since August 2016. The National Institute of Parasitic Diseases of the Chinese Center for Disease Control and Prevention (NIPD), as the only specialized institution for parasitic disease at the national level, has played a significant role in the malaria control, prevention, and elimination in China in the different historical periods. In order to transfer Chinese experiences on malaria control and elimination to other Low and Middle Income Countries (LMICs) and to improve global health collaboration, we have summarized and reviewed the contributions and achievements by the NIPD over the past 70 years, covering the epidemic situation; field investigation and laboratory experimental research on both parasite and vector; research and development on diagnostics, drugs, and insecticides; surveillance and response; technical and international. Support and cooperation. In addition, we also focus in particular on malaria retransmission risk, strategies on management of imported malaria cases and mobile populations, surveillance and response capacity to be maintained in post-elimination stage, challenges on diagnosis, drug resistance, and insecticide resistance as future concerns., (© 2020 Elsevier Ltd All rights reserved.)
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- 2020
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34. Lessons on malaria control in the ethnic minority regions in Northern Myanmar along the China border, 2007-2014.
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Wang RB, Dong JQ, Xia ZG, Cai T, Zhang QF, Zhang Y, Tian YH, Sun XY, Zhang GY, Li QP, Xu XY, Li JY, and Zhang J
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- Adolescent, Adult, Aged, Aged, 80 and over, Cross-Sectional Studies, Ethnicity, Female, Health Education, Humans, Incidence, Malaria epidemiology, Malaria transmission, Male, Middle Aged, Myanmar epidemiology, Prevalence, Young Adult, Malaria prevention & control
- Abstract
Background: For many countries where malaria is endemic, the burden of malaria is high in border regions. In ethnic minority areas along the Myanmar-China border, residents have poor access to medical care for diagnosis and treatment, and there have been many malaria outbreaks in such areas. Since 2007, with the support of the Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM), a malaria control project was introduced to reduce the malaria burden in several ethnic minority regions., Methods: A malaria control network was established during the period from 2007 to 2014. Multiple malaria interventions, including diagnosis, treatment, distribution of LLINs and health education, were conducted to improve the accessibility and quality of malaria control services for local residents. Annual cross-sectional surveys were conducted to evaluate intervention coverage and indicators of malaria transmission., Results: In ethnic minority regions where a malaria control network was established, both the annual malaria incidence (19.1 per thousand per year, in 2009; 8.7, in 2014) and malaria prevalence (13.6 % in 2008; 0.43 % in 2014) decreased dramatically during the past 5-6 years. A total of 851 393 febrile patients were detected, 202 598 malaria cases (including confirmed cases and suspected cases) were treated, and 759 574 LLINs were delivered to populations at risk. Of households in 2012, 73.9 % had at least one ITNs/LLINs (vs. 28.3 %, in 2008), and 50.7 % of children less than 5 years and 50.3 % of pregnant women slept under LLINs the night prior to their visit. Additionally, malaria knowledge was improved in 68.4 % of residents., Conclusion: There has been great success in improving malaria control in these regions from 2007 to 2014. Malaria burdens have decreased, especially in KOK and WA. The continued maintenance of sustainable malaria control networks in these regions may be a long-term process, due to regional conflicts and the lack of funds, technology, and health workers. Furthermore, information and scientific support from the international community should be offered to these ethnic minority regions to uphold recent achievements.
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- 2016
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35. Shrinking the malaria map in China: measuring the progress of the National Malaria Elimination Programme.
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Hu T, Liu YB, Zhang SS, Xia ZG, Zhou SS, Yan J, Cao J, and Feng ZC
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- China epidemiology, Epidemiological Monitoring, Humans, Incidence, Population Surveillance, Risk Assessment, Tibet epidemiology, Malaria epidemiology, Malaria prevention & control, National Health Programs standards
- Abstract
Background: Remarkable progress has been made towards the elimination of malaria in China since the National Malaria Elimination Programme (NMEP) was launched in 2010. The incidence of locally-acquired malaria cases has declined rapidly and endemic areas have also dramatically shrunk. In total, 3 078 malaria cases were reported in 2014, but only 56 cases were indigenous. In order to further promote the elimination programme, we reviewed the progress of and experiences associated with malaria elimination in China, and identified the challenges and priorities for the next stage of the programme., Methods: Data were collected from the web-based China Information System for Disease Control and Prevention, and the China Annual Report of Malaria Elimination. The progress towards the elimination of malaria from 2010 to 2014 was measured., Results: During the implementation of the NMEP from 2010 to 2014, local malaria incidence has declined continuously, only remaining in the Yunnan Province and Tibet Autonomous Region in 2014. By the end of 2015, 75.6 % (1 636/2 163) of the malaria-endemic counties passed the sub-national elimination assessment. The main challenges are cases of border malaria and imported malaria from other countries. Sustainable support and investment from the government, the establishment of an effective surveillance and response system, and risk assessments for the potential reintroduction of malaria are priorities for the next stage of the elimination programme., Conclusions: The NMEP in China has been successfully implemented thus far and the malaria map has shrunk dramatically. The priorities for malaria elimination are interventions to block transmission at border areas, management of imported malaria cases, preventing malaria reintroduction, capacity building, and sustainability of malaria surveillance and response.
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- 2016
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36. China's 1-3-7 surveillance and response strategy for malaria elimination: Is case reporting, investigation and foci response happening according to plan?
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Zhou SS, Zhang SS, Zhang L, Rietveld AE, Ramsay AR, Zachariah R, Bissell K, Van den Bergh R, Xia ZG, Zhou XN, and Cibulskis RE
- Subjects
- China epidemiology, Cross-Sectional Studies, Geography, Medical, Humans, Incidence, Malaria transmission, Rural Population, Time Factors, Disease Notification methods, Malaria epidemiology, Malaria prevention & control, Population Surveillance methods
- Abstract
Background: The China's 1-3-7 strategy was initiated and extensively adopted in different types of counties (geographic regions) for reporting of malaria cases within 1 day, their confirmation and investigation within 3 days, and the appropriate public health response to prevent further transmission within 7 days. Assessing the level of compliance to the 1-3-7 strategy at the county level is a first step towards determining whether the surveillance and response strategy is happening according to plan. This study assessed if the time-bound targets of the 1-3-7 strategy were being sustained over time. Such information would be useful to improve implementation of the 1-3-7 strategy in China., Methods: This cross-sectional study involved country-wide programmatic data for the period January 1st 2013 to June 30th 2014. Data variables were extracted from the national malaria information system and included socio-demographic information, type of county, date of diagnosis, date of reporting, date of case investigation, case classification (indigenous, or imported, or unknown), focus investigation, date of reactive case detection (RACD), and date of indoor residual spraying (IRS). Summary statistics and proportions were used and comparisons between groups were assessed using the chi-square test. Level of significance was set at a P-value ≤ 0.05., Results: Of a total of 5,688 malaria cases from 731 counties, there were 55 (1 %) indigenous cases (only in Type 1 and Type 2 counties) and 5,633 (99 %) imported cases from all types of counties. There was no delay in reporting malaria cases by type of county. In terms of case investigation, 97.5 % cases were investigated within 3 days with the proportion of delays (1.5 %) in type 2 counties, being significantly lower than type 1 counties (4.1 %). Regarding active foci, 96.4 % were treated by RACD and/or IRS., Conclusions: The performance of 1-3-7 strategy was encouraging but identified some challenges that if addressed can further improve implementation.
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- 2015
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37. Spatio-temporal analysis of malaria vectors in national malaria surveillance sites in China.
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Huang JX, Xia ZG, Zhou SS, Pu XJ, Hu MG, Huang DC, Ren ZP, Zhang SS, Yang MN, Wang DQ, and Wang JF
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- Animals, China epidemiology, Cluster Analysis, Female, Humans, Longitudinal Studies, Malaria epidemiology, Population Density, Population Surveillance, Spatio-Temporal Analysis, Time Factors, Animal Distribution physiology, Anopheles physiology, Insect Vectors physiology, Malaria transmission
- Abstract
Background: To reveal the spatio-temporal distribution of malaria vectors in the national malaria surveillance sites from 2005 to 2010 and provide reference for the current National Malaria Elimination Programme (NMEP) in China., Methods: A 6-year longitudinal surveillance on density of malaria vectors was carried out in the 62 national malaria surveillance sites. The spatial and temporal analyses of the four primary vectors distribution were conducted by the methods of kernel k-means and the cluster distribution of the most widely distribution vector of An.sinensis was identified using the empirical mode decomposition (EMD)., Results: Totally 4 species of Anopheles mosquitoes including An.sinensis, An.lesteri, An.dirus and An.minimus were captured with significant difference of distribution as well as density. An. sinensis was the most widely distributed, accounting for 96.25% of all collections, and its distribution was divided into three different clusters with a significant increase of density observed in the second cluster which located mostly in the central parts of China., Conclusion: This study first described the spatio-temporal distribution of malaria vectors based on the nationwide surveillance during 2005-2010, which served as a baseline for the ongoing national malaria elimination program.
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- 2015
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38. Establishing a China malaria diagnosis reference laboratory network for malaria elimination.
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Yin JH, Yan H, Huang F, Li M, Xiao HH, Zhou SS, and Xia ZG
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- China epidemiology, Clinical Laboratory Techniques methods, Clinical Laboratory Techniques standards, Diagnostic Tests, Routine methods, Diagnostic Tests, Routine standards, Humans, Malaria epidemiology, Microscopy methods, Microscopy standards, Polymerase Chain Reaction methods, Polymerase Chain Reaction standards, Disease Eradication methods, Laboratories organization & administration, Malaria diagnosis, Malaria prevention & control, Plasmodium isolation & purification
- Abstract
Background: In China, the prevalence of malaria has reduced dramatically due to the elimination programme. The continued success of the programme will depend upon the accurate diagnosis of the disease in the laboratory. The basic requirements for this are a reliable malaria diagnosis laboratory network and quality management system to support case verification and source tracking., Methods: The baseline information of provincial malaria laboratories in the China malaria diagnosis reference laboratory network was collected and analysed, and a quality-assurance activity was carried out to assess their accuracies in malaria diagnosis by microscopy using WHO standards and PCR., Results: By the end of 2013, nineteen of 24 provincial laboratories have been included in the network. In the study, a total of 168 staff were registered and there was no bias in their age, gender, education level, and position. Generally Plasmodium species were identified with great accuracy by microscopy and PCR. However, Plasmodium ovale was likely to be misdiagnosed as Plasmodium vivax by microscopy., Conclusions: China has established a laboratory network for primary malaria diagnosis which will cover a larger area. Currently, Plasmodium species can be identified fairly accurately by microscopy and PCR. However, laboratory staff need additional trainings on accurate identification of P. ovale microscopically and good performance of PCR operations.
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- 2015
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39. Elimination of malaria due to Plasmodium vivax in central part of the People's Republic of China: analysis and prediction based on modelling.
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Chen Z, Shi L, Zhou XN, Xia ZG, Bergquist R, and Jiang QW
- Subjects
- Bayes Theorem, China epidemiology, Cluster Analysis, Disease Eradication, Humans, Incidence, Malaria, Vivax epidemiology, Models, Statistical, Plasmodium vivax, Malaria, Vivax prevention & control
- Abstract
Five provinces in central People's Republic of China (P.R. China) have successfully reduced the burden of malaria due to Plasmodium vivax in the last 7 years. The results of the Action Plan of China Malaria Elimination (APCME) that commenced in 2010 are analysed against the background of the progress reached by the national malaria control programme (NMEP) that was launched in 2006. We examined the epidemiological changes in the number of autochthonous cases over time and discuss the feasibility of achieving the goal of malaria elimination by 2020. There was a total decline of 34,320 malaria cases between 2006 and 2012 arriving at an average annual incidence of 0.04 per 10,000 people by 2012. At the same time, the number of counties reporting autochthonous cases declined from 290 to 19. Spatial autocorrelation and Bayesian modelling were used to evaluate the datasets and predict the spatio-temporal pattern in the near future. The former approach showed that spatial clusters of P. vivax malaria existed in the study region during the study period, while the risk prediction map generated by the Bayesian model indicates that only sporadic malaria cases will appear during in the future. The results suggest that the initial NMEP approach and the follow-up APCME strategy have played a key role in reducing the threat of malaria in central P.R. China. However, to achieve the goal of malaria elimination by the end of the current decade, intervention plans must be adjusted with attention paid to those endemic counties still at risk according to the prediction map.
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- 2014
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40. Lessons from malaria control to elimination: case study in Hainan and Yunnan provinces.
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Xia ZG, Zhang L, Feng J, Li M, Feng XY, Tang LH, Wang SQ, Yang HL, Gao Q, Kramer R, Ernest T, Yap P, and Zhou XN
- Subjects
- China epidemiology, Humans, Malaria epidemiology, Plasmodium falciparum, Plasmodium vivax, Disease Eradication, Malaria prevention & control
- Abstract
Reduction patterns of Plasmodium falciparum and P. vivax malaria transmission and the role of an integrated strategy of case management and vector control are compared between different ecological zones. The epidemiology of malaria in Hainan and Yunnan provinces was disparate, even though distinct malaria control strategies have been adapted to different situations based on risk group, vector behaviours, local health infrastructure, and environmental conditions. The island Hainan appears to be victorious in eliminating malaria. However, there is still a long way to go to prevent the reintroduction of malaria in Hainan province and eliminating malaria in the border areas of Yunnan province. This review of the experiences and challenges from malaria control to elimination in Hainan and Yunnan provinces of southern China will provide a basis for the future elimination of malaria in the whole country., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Published
- 2014
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41. Surveillance and response to drive the national malaria elimination program.
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Feng XY, Xia ZG, Vong S, Yang WZ, and Zhou SS
- Subjects
- China epidemiology, Humans, Malaria epidemiology, Malaria transmission, Public Health Surveillance, Malaria prevention & control, National Health Programs
- Abstract
The national action plan for malaria elimination in China (2010-2020) was issued by the Chinese Ministry of Health along with other 13 ministries and commissions in 2010. The ultimate goal of the national action plan was to eliminate local transmission of malaria by the end of 2020. Surveillance and response are the most important components driving the whole process of the national malaria elimination programme (NMEP), under the technical guidance used in NMEP. This chapter introduces the evolution of the surveillance from the control to the elimination stages and the current structure of national surveillance system in China. When the NMEP launched, both routine surveillance and sentinel surveillance played critical role in monitoring the process of NMEP. In addition, the current response strategy of NMEP was also reviewed, including the generally developed "1-3-7 Strategy". More effective and sensitive risk assessment tools were introduced, which cannot only predict the trends of malaria, but also are important for the design and adjustment of the surveillance and response systems in the malaria elimination stage. Therefore, this review presents the landscape of malaria surveillance and response in China as well as their contribution to the NMEP, with a focus on activities for early detection of malaria cases, timely control of malaria foci and epidemics, and risk prediction. Furthermore, challenges and recommendations for accelerating NMEP through surveillance are put forward., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
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- 2014
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42. Transition from control to elimination: impact of the 10-year global fund project on malaria control and elimination in China.
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Wang RB, Zhang QF, Zheng B, Xia ZG, Zhou SS, Tang LH, Gao Q, Wang LY, and Wang RR
- Subjects
- China, Disease Eradication economics, Financial Management, Health Planning Guidelines, Humans, National Health Programs economics, National Health Programs trends, Disease Eradication standards, Malaria prevention & control, National Health Programs standards
- Abstract
The Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM) supported a project on the control and elimination of malaria in People's Republic of China which was one of the biggest-scale international cooperation programmes to control malaria in the country during the past 10 years. The project promoted the effective implementation of the Chinese national malaria control programme. On the basis of epidemiologic data, an overview of the project activities and key performance indicators, the overall impact of the GFATM project was evaluated. We also reviewed relevant programme features including technological and management approaches, with a focus on best practice, innovations in implementation and the introduction of international standards. Last, we summarised the multi-stakeholder cooperation mechanism and comments on its sustainability in the post-GFATM period. Recommendations for the future management of the Chinese national malaria elimination programme are put forward after considering the challenges, shortcomings and lessons learnt during the implementation of the GFATM project in China to sustain past achievements and foster the attainment of the ultimate goal of malaria elimination for the country., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Published
- 2014
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43. Feasibility and roadmap analysis for malaria elimination in China.
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Zhou XN, Xia ZG, Wang RB, Qian YJ, Zhou SS, Utzinger J, Tanner M, Kramer R, and Yang WZ
- Subjects
- China epidemiology, Feasibility Studies, Humans, Malaria epidemiology, Malaria transmission, Risk Assessment, Disease Eradication, Malaria prevention & control
- Abstract
To understand the current status of the malaria control programme at the county level in accordance with the criteria of the World Health Organisation, the gaps and feasibility of malaria elimination at the county and national levels were analysed based on three kinds of indicators: transmission capacity, capacity of the professional team, and the intensity of intervention. Finally, a roadmap for national malaria elimination in the People's Republic of China is proposed based on the results of a feasibility assessment at the national level., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Published
- 2014
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44. Preparedness for malaria resurgence in China: case study on imported cases in 2000-2012.
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Feng J, Xia ZG, Vong S, Yang WZ, Zhou SS, and Xiao N
- Subjects
- China epidemiology, Humans, Malaria transmission, Prevalence, Health Planning standards, Malaria epidemiology, Malaria prevention & control, Travel
- Abstract
Malaria is the most important parasitic protozoan infection that has caused serious threats to human health globally. China has had success in reducing the morbidity and mortality of malaria to the lowest level through sustained and large-scale interventions. Although the total number of malaria cases declined gradually, the burden of the imported malaria cases mainly from Southeast Asian and African countries has increased substantially since 2000, posing a severe threat to public health in China. This review explores and analyses the epidemiological characteristics of the imported malaria based on data from 2000 to 2012, in order to provide theoretical bases and insights into effective prevention, avoid the resurgence of malaria in malaria-susceptible areas and develop appropriate strategies to protect people's health in China. This review also intends to offer the useful information of innovative approaches and tools that are required for malaria elimination in various settings., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
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- 2014
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45. Preparation for malaria resurgence in China: approach in risk assessment and rapid response.
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Qian YJ, Zhang L, Xia ZG, Vong S, Yang WZ, Wang DQ, and Xiao N
- Subjects
- China epidemiology, Humans, Malaria prevention & control, National Health Programs standards, Research, Risk Assessment, Risk Factors, Health Planning, Malaria epidemiology
- Abstract
With the shrinking of indigenous malaria cases and endemic areas in the People's Republic of China (P.R. China), imported malaria predominates over all reported cases accounting for more than 90% of the total. On the way to eliminate malaria, prompt detection and rapid response to the imported cases are crucial for the prevention of secondary transmission in previous endemic areas. Through a comprehensive literature review, this chapter aims to identify risk determinants of potential local transmission caused by the imported malaria cases and discusses gaps to be addressed to reach the elimination goal by 2020. Current main gaps with respect to dealing with potential malaria resurgence in P.R. China include lack of cross-sectoral cooperation, lack of rapid response and risk assessment, poor public awareness, and inadequate research and development in the national malaria elimination programme., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Published
- 2014
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46. Historical patterns of malaria transmission in China.
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Yin JH, Zhou SS, Xia ZG, Wang RB, Qian YJ, Yang WZ, and Zhou XN
- Subjects
- China, Disease Eradication, History, 20th Century, History, 21st Century, Humans, Malaria history, Malaria parasitology, Malaria transmission
- Abstract
The historical patterns of malaria transmission in the People's Republic of China from 1949 to 2010 are presented in this chapter to illustrate the changes in epidemiological features and malaria burden during five decades. A significant reduction of malaria incidence has resulted in initiation of a national malaria elimination programme. However, challenges in malaria elimination have been identified. Foci (or hot spots) have occurred in unstable transmission areas, indicating an urgent need for strengthened surveillance and response in the transition stage from control to elimination., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
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- 2014
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47. Research gaps for three main tropical diseases in the People's Republic of China.
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Zheng Q, Vanderslott S, Jiang B, Xu LL, Liu CS, Huo LL, Duan LP, Wu NB, Li SZ, Xia ZG, Wu WP, Hu W, and Zhang HB
- Abstract
This scoping review analyzes the research gaps of three diseases: schistosomiasis japonica, malaria and echinococcosis. Based on available data in the P.R. China, we highlight the gaps between control capacity and prevalence levels, and between diagnostic/drug development and population need for treatment at different stages of the national control programme. After reviewing the literature from 848 original studies and consultations with experts in the field, the gaps were identified as follows. Firstly, the malaria research gaps include (i) deficiency of active testing in the public community and no appropriate technique to evaluate elimination, (ii) lack of sensitive diagnostic tools for asymptomatic patients, (iii) lack of safe drugs for mass administration. Secondly, gaps in research of schistosomiasis include (i) incongruent policy in the implementation of integrated control strategy for schistosomiasis, (ii) lack of effective tools for Oncomelania sp. snail control, (iii) lack of a more sensitive and cheaper diagnostic test for large population samples, (iv) lack of new drugs in addition to praziquantel. Thirdly, gaps in research of echinococcosis include (i) low capacity in field epidemiology studies, (ii) lack of sanitation improvement studies in epidemic areas, (iii) lack of a sensitivity test for early diagnosis, (iv) lack of more effective drugs for short-term treatment. We believe these three diseases can eventually be eliminated in mainland China if all the research gaps are abridged in a short period of time.
- Published
- 2013
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48. Students' awareness of malaria at the beginning of national malaria elimination programme in China.
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Yin JH, Wang RB, Xia ZG, Zhou SS, Zhou XN, Zhang QF, and Feng XY
- Subjects
- Adolescent, Child, China, Cross-Sectional Studies, Female, Humans, Malaria diagnosis, Malaria drug therapy, Malaria prevention & control, Male, Surveys and Questionnaires, Health Knowledge, Attitudes, Practice, Malaria epidemiology, Students
- Abstract
Background: In the battle against malaria in China, the rate of elementary and high school students' awareness on malaria knowledge is an important index for malaria elimination, but only rare data is available. This study aimed to investigate the level of malaria awareness in students at elementary and high schools in malaria endemic areas of China, and to provide the baseline information for the malaria elimination., Methods: This cross-sectional survey was conducted in 20 different malaria-endemic provinces in the first year of China's National Malaria Elimination Programme (NMEP). A structured questionnaire was administrated to students at elementary and high schools enrolled. A total of 44,519 questionnaires were effective while 1,220 were excluded because of incomplete survey responses., Results: More than 60% of students were aware of malaria, but only 9,013 of them answered correctly to all five questions, and there were still 1,862 students unaware of malaria. There were significant differences of the awareness of malaria among different age groups, between male and female, between two different education levels., Discussion: The study reveals that students at elementary and high school levels did not have adequate knowledge of malaria about biology, pathogenicity, transmitting vectors and preventive methods and so on at the beginning of NMEP in China. Further emphasis should be paid on health education campaigns in China to increase students' public awareness of malaria about vector control, treatment, prevention.
- Published
- 2013
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49. A potential threat to malaria elimination: extensive deltamethrin and DDT resistance to Anopheles sinensis from the malaria-endemic areas in China.
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Wang DQ, Xia ZG, Zhou SS, Zhou XN, Wang RB, and Zhang QF
- Subjects
- Animals, Biological Assay, China epidemiology, Disease Vectors, Female, Humans, Malaria epidemiology, Survival Analysis, Anopheles drug effects, DDT pharmacology, Insecticide Resistance, Insecticides pharmacology, Malaria prevention & control, Nitriles pharmacology, Pyrethrins pharmacology
- Abstract
Background: Insecticide resistance in malaria vectors is a growing concern in many countries and requires immediate attention because of the limited chemical arsenal available for vector control. There is lack of systematic and standard monitoring data of malaria vector resistance in the endemic areas, which is essential for the ambitious goal of malaria elimination programme of China., Methods: In 2010, eight provinces from different malaria endemic region were selected for study areas. Bioassays were performed on F1 progeny of Anopheles sinensis reared from wild-caught females using the standard WHO susceptibility test with diagnostic concentrations of 0.25% deltamethrin and 4% DDT., Results: For An. sinensis, the results indicated that exposure to 0.25% deltamethrin of F1 families with mortalities ranging from 5.96% to 64.54% and less than 80% mortality to DDT at the diagnostic concentration of 4% across the study areas., Conclusions: Anopheles sinensis was completely resistant to both deltamethrin and DDT, and resistance to pyrethroid has risen strikingly compared to that recorded during 1990s. The results highlight the importance of longitudinal insecticide resistance monitoring and the urgent need for a better understanding of the status of insecticide resistance in this region.
- Published
- 2013
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