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Prevalence of hepatitis E virus (HEV) infection in various pig farms from Shaanxi Province, China: First detection of HEV RNA in pig semen.
- Source :
-
Transboundary and emerging diseases [Transbound Emerg Dis] 2019 Jan; Vol. 66 (1), pp. 72-82. Date of Electronic Publication: 2018 Jul 24. - Publication Year :
- 2019
-
Abstract
- The zoonotic transmission of hepatitis E virus (HEV) is mainly mediated by HEV genotypes 3 and 4, with domestic pigs serving as an important reservoir for both genotypes. In China, genotype 4 HEV is the primary prevalent genotype on pig farms. In this study, the prevalence of HEV infection in pig herds of Shaanxi Province was investigated. Serological testing detected anti-HEV antibody-positive pigs in five selected cities, with 13 of 17 farms harbouring at least one positive pig (76.47%). Within positive farms, the proportion of positive pigs ranged from 1.6% to 37.5%. Genetic detection analyses of faecal samples revealed that pigs in four cities and on nine of 17 farms were positive for sequences homologous to a partial ORF2-coding region of HEV (306 bp), as were 6 of 53 bile and 1 of 26 semen samples. Meanwhile, DNA coding for partial HEV ORF1 (1,080 bp) and a longer gene segment coding for partial ORF2 (1,594 bp) were successfully amplified from RNA isolated from pig semen from one HEV-positive pig. Sequence comparisons of partial ORF2 gene sequences showed that HEV isolates from Shaanxi Province shared the highest identity (81.4%-96.1%) with genotype 4 HEV. Phylogenetic tree analysis grouped these isolates into three subgenotypes (4d, 4h and 4i), with subgenotype 4i the predominant subgenotype. In addition, the HEV isolate from pig semen belonged to subgenotype 4i HEV based on phylogenetic trees constructed both using partial ORF1 and ORF2 gene sequences. In conclusion, HEV infection is endemic on pig farms of Shaanxi Province, China, and 4i is the predominant HEV subgenotype. More important, this is the first study demonstrating detection of HEV RNA in pig semen, suggesting that artificial insemination can transmit HEV in pigs.<br /> (© 2018 Blackwell Verlag GmbH.)
- Subjects :
- Animals
China epidemiology
Feces virology
Genotype
Hepatitis E epidemiology
Hepatitis E virology
Male
Open Reading Frames genetics
Phylogeny
Prevalence
RNA, Viral analysis
Sequence Analysis, RNA veterinary
Seroepidemiologic Studies
Swine
Swine Diseases virology
Hepatitis E veterinary
Hepatitis E virus genetics
Semen
Swine Diseases epidemiology
Subjects
Details
- Language :
- English
- ISSN :
- 1865-1682
- Volume :
- 66
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Transboundary and emerging diseases
- Publication Type :
- Academic Journal
- Accession number :
- 30043495
- Full Text :
- https://doi.org/10.1111/tbed.12966