Detection of Hepatitis E Virus Infections among Domestic Swine in the Kathmandu Valley of Nepal

Edward T. Clayson Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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Bruce L. Innis Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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Khin Saw Aye Myint Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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Sumitda Narupiti Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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David W. Vaughn Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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Sabitri Giri Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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Padma Ranabhat Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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Mrigendra P. Shrestha Department of Virology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences (AFRIMS), Infectious Disease Hospital, Bangkok, Thailand

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The prevalence of hepatitis E virus (HEV) infections among 55 domestic swine living in the Kathmandu Valley of Nepal was investigated. Sera and stool specimens were collected from 47 free-roaming swine and examined for the presence of HEV genomic sequences by the reverse transcription-polymerase chain reaction. Sera from these animals, as well as sera from eight other swine, were also examined for the presence of HEV-specific antibodies by an enzyme-linked immunosorbent assay and by a fluorescent antibody blocking assay. Hepatitis E virus RNA was detected in the sera and/or stool of three of 47 swine, while HEV-specific antibodies were detected in 18 of 55 swine. These results indicate that HEV is a zoonotic virus, and that swine are among its natural hosts.

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