文献类型：期刊文献

英文题名：Genetic diversity within dominant Enterocytozoon bieneusi genotypes in pre-weaned calves

作者：Tang, Chuanxiang[1,2];Cai, Min[3];Wang, Lin[1];Guo, Yaqiong[2];Li, Na[2];Feng, Yaoyu[1,2];Xiao, Lihua[4]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]South China Agr Univ, Minist Agr, Coll Vet Med, Key Lab Zoonosis, Guangzhou 510642, Guangdong, Peoples R China;[3]Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China;[4]Natl Ctr Emerging & Zoonot Infect Dis, Ctr Dis Control & Prevent, 4Divis Foodborne Waterborne & Environm Dis, Atlanta, GA 30333 USA

年份：2018

卷号：11

外文期刊名：PARASITES & VECTORS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000427134000003)】；

基金：This work was supported by the National Natural Science Foundation of China (grants 31630078, 31425025 and 31502055). The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the U.S. Centers for Disease Control and Prevention. We thank the farm owners and staff for their cooperation in sample collection during this study.

语种：英文

外文关键词：Enterocytozoon bieneusi; Transmission; Dairy calves; Genetic diversity; Multilocus sequence typing

摘要：Background: Cattle are commonly infected with the microsporidian parasite Enterocytozoon bieneusi. Sequence characterization of E. bieneusi in these animals at the ribosomal internal transcribed spacer (ITS) locus had identified I, J and BEB4 as the dominant genotypes. However, current studies on E. bieneusi in dairy cattle are mostly on infection rates and genotype distribution. This study aims to examine the intragenotypic diversity within dominant E. bieneusi genotypes in pre-weaned dairy calves in Shanghai, China. Methods: Enterocytozoon bieneusi genotypes and subtypes were identified by PCR sequence analysis of ITS and multilocus sequence typing (MLST), based on material from farms. Chi-square test was used to examine differences in E. bieneusi infection rates between farms or age groups. Results: The overall infection rate of E. bieneusi was 26.5% (214/809), ranging from 12.6% (Farm 5) to 38.5% (Farm 4). Infection rates increased with age during early life, with the peak infection rate (43.0%; 43/100) occurring at six weeks. Four genotypes were present, including J (n = 145, 67.8%), BEB4 (n = 59, 27.6%), CHN4 (n = 4, 1.9%) and CHN15 (n = 1, 0.5%), with the former two belonging to Group 2 and the latter two belonging to Group 1. Differences were detected in the distribution of the dominant genotypes J and BEB4 among five study farms. Altogether, 10 multilocus genotypes (MLGs) were identified in the two dominant ITS genotypes, including MLG-J1 to MLG-J8 of genotype J and MLG-B1 to MLG-B2 of genotype BEB4. MLG-B1 and MLG-B2 were recovered in Farms 1, 2 and 5, whereas MLG-J1 to MLG-J5 and MLG-J6 to MLG-J8 were found in Farms 3 and 4, respectively. Conclusions: There is extensive genetic heterogeneity within the dominant E. bieneusi genotypes J and BEB4 in dairy calves in Shanghai, China, and MLST should be used in molecular epidemiological studies of E. bieneusi in cattle.