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2. Analysis of a super-transmission of SARS-CoV-2 omicron variant BA.5.2 in the outdoor night market

Author

Mingyu Luo, Shelan Liu, Liebo Zhu, Fengying Wang, Kunyang Wu, Hanqing He, Xiaohua Qi, Zhifeng Pang, Xuanjun Dong, Zhenyu Gong, and Min Yu

Subjects
COVID-19, aerosol transmission, omicron, outbreak, aerosol suspension time, Public aspects of medicine, RA1-1270
Abstract

IntroductionThe COVID-19 pandemic continues to ravage the world, and mutations of the SARS-CoV-2 continues. The new strain has become more transmissible. The role of aerosol transmission in the pandemic deserves great attention.MethodsIn this observational study, we collected data from market customers and stallholders who had been exposed to the virus in the Qingkou night market on July 31 and were subsequently infected. We analyzed the possible infection zones of secondary cases and aerosol suspension time in ambient air. We described and analyzed the characteristics of the secondary cases and the transmission routes for customers.ResultsThe point source outbreak of COVID-19 in Qingkou night market contained a cluster of 131 secondary cases. In a less-enclosed place like the Qingkou night market, aerosols with BA.5.2 strain released by patients could suspend in ambient air up to 1 h 39 min and still be contagious.ConclusionAerosols with viruses can spread over a relatively long distance and stay in ambient air for a long time in a less enclosed space, but shorter than that under experimental conditions. Therefore, the aerosol suspension time must be considered when identifying and tracing close contact in outbreak investigations.

Published
2023
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3. Once malaria is eliminated, more attention should be paid to imported malaria: Data from five years of surveillance in the City of Yiwu in eastern China

Author

Liebo Zhu, Xiayan Feng, Jie Yang, Lianqin Lou, Linong Yao, and Xuanjun Dong

Subjects
Adult, Male, China, Health (social science), 030231 tropical medicine, General Biochemistry, Genetics and Molecular Biology, 03 medical and health sciences, 0302 clinical medicine, Communicable Diseases, Imported, parasitic diseases, medicine, Humans, 030212 general & internal medicine, Socioeconomics, Disease Notification, Imported malaria, biology, Eastern china, Plasmodium falciparum, General Medicine, medicine.disease, biology.organism_classification, Malaria, Geography, Epidemiological Monitoring, Female, Male to female
Abstract

This study reviewed and analyzed data on malaria cases in Yiwu from 2012 to 2016 via a webbased system for managing and reporting information on infectious diseases. A total of 161 cases were diagnosed (77.02% due to Plasmodium falciparum, 18.01% due to P. vivax, 4.35% due to P. ovale, and 0.62% due to P. malariae). One case was imported from Yunnan Province in China and the others were imported from overseas. The ratio of male to female patients was 7.47:1. The average age was 36.34 years (SD: 9.63). Most cases (87.58%) were imported from 1 of 30 countries in Africa. As malaria is gradually being eliminated in China, the main task at this stage has transitioned to the prevention and control of cases of imported malaria. Particular attention should be paid to malaria cases from Africa.

Published
2017

4. A cluster of Zika virus infection in a Chinese tour group returning from Fiji and Samoa

Author

Liebo Zhu, Xiaohua Qi, Tao Fu, Haiyan Mao, Zhen Wang, Yanjun Zhang, Xuanjun Dong, Zhiping Chen, Qiyong Liu, Jimin Sun, Jiangping Ren, Shannon Rutherford, Zhenyu Gong, Enfu Chen, Hongjie Yu, Wenxian Chen, Yin Chen, Zhihong Zhu, and Junhang Pan

Subjects
medicine.medical_specialty, Multidisciplinary, biology, business.industry, 030231 tropical medicine, Attack rate, Outbreak, Disease cluster, biology.organism_classification, Virology, Asymptomatic, Article, Zika virus, 03 medical and health sciences, 0302 clinical medicine, Epidemiology, medicine, 030212 general & internal medicine, medicine.symptom, business, Index case, human activities
Abstract

Zika virus is currently causing extensive outbreaks in a number of countries in South and Central America and the Caribbean and has been associated with foetal abnormalities. We report an outbreak of Zika virus infection in a Chinese tour-group returning from a nine day holiday in Fiji and Samoa. The index case was a 38-year old male who developed symptoms while travelling back from Fiji to Hong Kong on the 14th February, 2016. A field investigation was initiated to define the epidemiological, clinical and virological characteristics of Zika virus infection in this tour group and revealed two further symptomatic infections and one asymptomatic infection among the 33 travellers; an overall infection attack rate of 12% in these travellers. Active surveillance led to detection of Zika virus RNA in the serum of one case four days prior to onset of symptoms and detection of Zika virus in saliva from one asymptomatic infection.

Published
2017

5. Once malaria is eliminated, more attention should be paid to imported malaria: Data from five years of surveillance in the City of Yiwu in eastern China.

Author

Xuanjun Dong, Jie Yang, Lianqin Lou, Liebo Zhu, Xiayan Feng, and Linong Yao

Subjects
*PLASMODIUM falciparum, *DATA analysis, MALARIA transmission
Abstract

This study reviewed and analyzed data on malaria cases in Yiwu from 2012 to 2016 via a web-based system for managing and reporting information on infectious diseases. A total of 161 cases were diagnosed (77.02% due to Plasmodium falciparum, 18.01% due to P. vivax, 4.35% due to P. ovale, and 0.62% due to P. malariae). One case was imported from Yunnan Province in China and the others were imported from overseas. The ratio of male to female patients was 7.47:1. The average age was 36.34 years (SD: 9.63). Most cases (87.58%) were imported from 1 of 30 countries in Africa. As malaria is gradually being eliminated in China, the main task at this stage has transitioned to the prevention and control of cases of imported malaria. Particular attention should be paid to malaria cases from Africa. [ABSTRACT FROM AUTHOR]

Published
2017
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