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Start Over Author "Feng Meng" Journal parasitology research
9 results on '"Feng Meng"'

2. Toxoplasma gondii, Dirofilaria immitis, feline immunodeficiency virus (FIV), and feline leukemia virus (FeLV) infections in stray and pet cats (Felis catus) in northwest China: co-infections and risk factors

Author

Radu Blaga, Xing-Quan Zhu, Ai-Dong Qian, Wei Cong, Isabelle Villena, Qing-Feng Meng, Protozooses Transmises par l'Alimentation (Cryptosporidiose, Giardose et Toxoplasmose) : Mode de Contamination et Pathogénie (PROTAL) - EA 3800 (PROTAL), Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-SFR CAP Santé (Champagne-Ardenne Picardie Santé), and Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Université de Reims Champagne-Ardenne (URCA)

Subjects
0301 basic medicine, Male, Feline immunodeficiency virus, animal diseases, viruses, Antibodies, Protozoan, Cat Diseases, Polymerase Chain Reaction, 0403 veterinary science, [SDV.MHEP.MI]Life Sciences [q-bio]/Human health and pathology/Infectious diseases, Risk Factors, Seroepidemiologic Studies, Direct agglutination test, ComputingMilieux_MISCELLANEOUS, biology, Coinfection, Leukemia Virus, Feline, virus diseases, 04 agricultural and veterinary sciences, General Medicine, 030108 mycology & parasitology, 3. Good health, Infectious Diseases, [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology, Female, Dirofilariasis, Toxoplasma, Polymorphism, Restriction Fragment Length, China, Genotype, 040301 veterinary sciences, Dirofilaria immitis, Immunodeficiency Virus, Feline, Feline leukemia virus, 03 medical and health sciences, Feline Acquired Immunodeficiency Syndrome, Agglutination Tests, parasitic diseases, medicine, Seroprevalence, Animals, [SDV.EE.SANT]Life Sciences [q-bio]/Ecology, environment/Health, General Veterinary, Toxoplasma gondii, medicine.disease, biology.organism_classification, Virology, Toxoplasmosis, Animal, Insect Science, Cats, Parasitology
Abstract

This study was conducted to estimate the prevalence of Toxoplasma gondii, Dirofilaria immitis, feline immunodeficiency virus (FIV), and feline leukemia virus (FeLV) infections among stray and pet cats in Lanzhou, northwest China, and to identify the influence of age, gender, and regions on seropositivity. T. gondii antibodies were examined in cat sera by the modified agglutination test (MAT). The circulating antigens of D. immitis and FeLV and specific antibodies to FIV were examined using kits commercially available. The overall prevalence of T. gondii, FIV, FeLV, and D. immitis was 19.34, 9.12, 11.33, and 3.04 %, respectively. For the genetic characterization of T. gondii genotypes in cats, genomic DNA was extracted from the seropositive cats and the T. gondii B1 gene was amplified using a semi-nested PCR. DNA samples giving positive B1 amplification were then genotyped using multilocus PCR-RFLP. Two T. gondii genotypes (ToxoDB#9 and ToxoDB#1) were identified. Results of the multivariate logistic regression analysis showed that older cats are more likely to be seropositive than juveniles for T. gondii, FIV, FeLV, and D. immitis. This is the first report of T. gondii genotypes in cats in northwest China. Moreover, the present study is the first study of retrovirus and D. immitis seroprevalence in cats in China. The results revealed that T. gondii, FIV, and FeLV infections are common in stray and pet cats in northwest China.

Published
2015

3. Herd-level prevalence and associated risk factors for Toxoplasma gondii, Neospora caninum, Chlamydia abortus and bovine viral diarrhoea virus in commercial dairy and beef cattle in eastern, northern and northeastern China

Author

Chun-Feng Wang, Ai-Dong Qian, Wei Cong, Qing-Feng Meng, Wu-Wen Sun, and Xiao-Feng Shan

Subjects
Diarrhea, Male, Veterinary medicine, medicine.medical_specialty, China, animal diseases, Antibodies, Protozoan, Cattle Diseases, Beef cattle, Antibodies, Viral, Virus, Medical microbiology, Risk Factors, Seroepidemiologic Studies, parasitic diseases, medicine, Seroprevalence, Animals, Chlamydia, Pathogen, Diarrhea Viruses, Bovine Viral, General Veterinary, biology, Coccidiosis, Neospora, Toxoplasma gondii, General Medicine, Chlamydia Infections, biology.organism_classification, Virology, Neospora caninum, Infectious Diseases, Toxoplasmosis, Animal, Insect Science, Herd, Parasitology, Bovine Virus Diarrhea-Mucosal Disease, Cattle, Female, Toxoplasma
Abstract

Although the seroprevalence of Toxoplasma gondii, Neospora caninum, Chlamydia abortus and bovine viral diarrhea virus infection in cattle have been reported in some areas in China, most of them were conducted with small number of cattle samples and very limited districts and neglected the assessment of herd management factors associated with herd-level prevalence of these pathogen infections. Thus, from September 2013 to December 2014, a large-scale seroprevalence study was conducted to determine the animal-level and herd-level seroprevalence and identify herd-level risk factors associated with these pathogen infections in 4487 cattle from 134 herds in five provinces (Heilongjiang, Jilin, Liaoning, Shandong, Hebei) and Inner Mongolia Autonomous Region of China. At animal level, the true prevalence of antibodies against T. gondii, N. caninum, C. abortus and bovine viral diarrhoea virus (BVDV) was 10.48, 17.14, 11.92 and 50.10 %, respectively. At herd level, the true prevalence of antibodies against T. gondii, N. caninum, C. abortus and BVDV was 27.16, 29.10, 37.31 and 40.30 %, respectively. Multivariate analysis of these characteristics showed that source of water and presence of felids were significantly associated with T. gondii infection in the studied cattle herds. Source of water was significantly associated with N. caninum infection in the studied cattle herds. While herd size and management system were significantly associated with BVDV infection in the studied cattle herds, this is the first report of herd-level prevalence and associated risk factors of T. gondii, N. caninum, C. abortus and BVDV infection in cattle in China.

Published
2015

4. Prevalence and genotypic diversity of Entamoeba species in inhabitants in Kathmandu, Nepal.

Author

Tachibana, Hiroshi, Feng, Meng, Cheng, Xunjia, Pandey, Basu Dev, Pandey, Kishor, Yanagi, Tetsuo, Wang, Ting, Putaporntip, Chaturong, Jongwutiwes, Somchai, and Sherchand, Jeevan B.

Subjects
*BIODIVERSITY, *GENOTYPES, *ENTAMOEBA, *SHORT tandem repeat analysis, *RNA sequencing, *GENETICS
Abstract

In Nepal, gastrointestinal infections due to parasites including Entamoeba species are common. The main aim of this study was to identify species of Entamoeba using genotypic analysis. The prevalence of Entamoeba infections was examined by PCR in fecal samples from 143 inhabitants living close to wild rhesus macaques in Kathmandu, Nepal. The numbers of positive cases were one (0.7%) for E. histolytica, eight (5.6%) for E. dispar, seven (4.9%) for E. coli, and two (1.4%) for E. chattoni (E. polecki ST2). No infections with E. nuttalli, E. moshkovskii, and E. polecki ST1 were found. In E. dispar, at least seven different genotypes were detected from the eight samples by sequence analysis of tRNA-linked short tandem repeats. Different genotypes were found even in a couple from the same family. This is the first report demonstrating that E. dispar with high genotypic diversity is prevalent, rather than E. histolytica, in Kathmandu, and that zoonotic transmission of E. chattoni from rhesus macaques might occur in the inhabitants. [ABSTRACT FROM AUTHOR]

Published
2018
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9. Correlation between genotypes of tRNA-linked short tandem repeats in Entamoeba nuttalli isolates and the geographical distribution of host rhesus macaques.

Author

Feng, Meng, Komiyama, Tomoyoshi, Yanagi, Tetsuo, Cheng, Xunjia, Sherchand, Jeevan, and Tachibana, Hiroshi

Subjects
*TRANSFER RNA, *RHESUS monkeys, *ENTAMOEBA, *SHORT tandem repeat analysis, *BIOMARKERS, *PROTOZOA
Abstract

Several polymorphic markers, including serine-rich protein genes, have been used for the genotyping of isolates from the morphologically indistinguishable protozoan parasites Entamoeba histolytica, Entamoeba dispar, and Entamoeba nuttalli. Genotypes of tRNA-linked short tandem repeats (STRs) are highly polymorphic, but the correlation with geographical distribution is unknown. We have recently isolated 15 E. nuttalli strains from wild rhesus macaques in four locations in Kathmandu Valley, Nepal. The sequences of the serine-rich protein genes of the E. nuttalli strains differed among the four locations. In this study, we analyzed tRNA-linked STRs in six loci of the 15 strains. Two genotypes were found in loci N-K2, R-R, and S-D, three in locus S-Q, and five in locus D-A. In locus A-L, one major genotype and ten minor genotypes were found, resulting in mixtures of two to six genotypes in eight strains. By combination of the main genotypes in the six loci, the 15 strains were divided into nine genotypes. The genotypes observed in E. nuttalli strains were quite different from those in E. histolytica and E. dispar. A phylogenetic tree constructed from tRNA-linked STRs in the six loci reflected the different places of isolation. These results suggest that sequence diversity of tRNA-linked STRs in E. nuttalli occurs with relatively high frequency and might be a marker of geographical distribution of host rhesus macaques, even in limited areas. [ABSTRACT FROM AUTHOR]

Published
2014
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