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Molecular epidemiology of avian influenza viruses circulating among healthy poultry flocks in farms in northern Vietnam.
Prev Vet Med 2012; 103(2-3):192-200PV

Abstract

Repeated epizootics of highly pathogenic avian influenza (HPAI) virus subtype H5N1 were reported from 2003 to 2005 among poultry in Vietnam. More than 200 million birds were killed to control the spread of the disease. Human cases of H5N1 infection have been sporadically reported in an area where repeated H5N1 outbreaks among birds had occurred. Subtype H5N1 strains are established as endemic among poultry in Vietnam, however, insights into how avian influenza viruses including the H5N1 subtype are maintained in endemic areas is not clear. In order to determine the prevalence of different avian influenza viruses (AIVs), including H5N1 circulating among poultry in northern Vietnam, surveillance was conducted during the years 2006-2009. A subtype H5N1 strain was isolated from an apparently healthy duck reared on a farm in northern Vietnam in 2008 and was identified as an HPAI. Although only one H5N1 virus was isolated, it supports the view that healthy domestic ducks play a pivotal role in maintaining and transmitting H5N1 viruses which cause disease outbreaks in northern Vietnam. In addition, a total of 26 AIVs with low pathogenicity were isolated from poultry and phylogenetic analysis of all the eight gene segments revealed their diverse genetical backgrounds, implying that reassortments have occurred frequently among strains in northern Vietnam. It is, therefore, important to monitor the prevalence of influenza viruses among healthy poultry between epidemics in an area where AIVs are endemic.

Authors+Show Affiliations

Kyoto Sangyo University, Kamigamo-motoyama, Kita, Kyoto, Japan. tyamashi@nagasaki-u.ac.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21974815

Citation

Takakuwa, Hiroki, et al. "Molecular Epidemiology of Avian Influenza Viruses Circulating Among Healthy Poultry Flocks in Farms in Northern Vietnam." Preventive Veterinary Medicine, vol. 103, no. 2-3, 2012, pp. 192-200.
Takakuwa H, Yamashiro T, Le MQ, et al. Molecular epidemiology of avian influenza viruses circulating among healthy poultry flocks in farms in northern Vietnam. Prev Vet Med. 2012;103(2-3):192-200.
Takakuwa, H., Yamashiro, T., Le, M. Q., Phuong, L. S., Ozaki, H., Tsunekuni, R., ... Otsuki, K. (2012). Molecular epidemiology of avian influenza viruses circulating among healthy poultry flocks in farms in northern Vietnam. Preventive Veterinary Medicine, 103(2-3), pp. 192-200. doi:10.1016/j.prevetmed.2011.09.014.
Takakuwa H, et al. Molecular Epidemiology of Avian Influenza Viruses Circulating Among Healthy Poultry Flocks in Farms in Northern Vietnam. Prev Vet Med. 2012 Feb 1;103(2-3):192-200. PubMed PMID: 21974815.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Molecular epidemiology of avian influenza viruses circulating among healthy poultry flocks in farms in northern Vietnam. AU - Takakuwa,Hiroki, AU - Yamashiro,Tetsu, AU - Le,Mai Q, AU - Phuong,Lien S, AU - Ozaki,Hiroichi, AU - Tsunekuni,Ryota, AU - Usui,Tatsufumi, AU - Ito,Hiroshi, AU - Morimatsu,Masami, AU - Tomioka,Yukiko, AU - Yamaguchi,Tsuyoshi, AU - Ito,Toshihiro, AU - Murase,Toshiyuki, AU - Ono,Etsuro, AU - Otsuki,Koichi, Y1 - 2011/10/04/ PY - 2011/02/05/received PY - 2011/08/30/revised PY - 2011/09/12/accepted PY - 2011/10/7/entrez PY - 2011/10/7/pubmed PY - 2012/4/11/medline SP - 192 EP - 200 JF - Preventive veterinary medicine JO - Prev. Vet. Med. VL - 103 IS - 2-3 N2 - Repeated epizootics of highly pathogenic avian influenza (HPAI) virus subtype H5N1 were reported from 2003 to 2005 among poultry in Vietnam. More than 200 million birds were killed to control the spread of the disease. Human cases of H5N1 infection have been sporadically reported in an area where repeated H5N1 outbreaks among birds had occurred. Subtype H5N1 strains are established as endemic among poultry in Vietnam, however, insights into how avian influenza viruses including the H5N1 subtype are maintained in endemic areas is not clear. In order to determine the prevalence of different avian influenza viruses (AIVs), including H5N1 circulating among poultry in northern Vietnam, surveillance was conducted during the years 2006-2009. A subtype H5N1 strain was isolated from an apparently healthy duck reared on a farm in northern Vietnam in 2008 and was identified as an HPAI. Although only one H5N1 virus was isolated, it supports the view that healthy domestic ducks play a pivotal role in maintaining and transmitting H5N1 viruses which cause disease outbreaks in northern Vietnam. In addition, a total of 26 AIVs with low pathogenicity were isolated from poultry and phylogenetic analysis of all the eight gene segments revealed their diverse genetical backgrounds, implying that reassortments have occurred frequently among strains in northern Vietnam. It is, therefore, important to monitor the prevalence of influenza viruses among healthy poultry between epidemics in an area where AIVs are endemic. SN - 1873-1716 UR - https://www.unboundmedicine.com/medline/citation/21974815/Molecular_epidemiology_of_avian_influenza_viruses_circulating_among_healthy_poultry_flocks_in_farms_in_northern_Vietnam_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0167-5877(11)00283-2 DB - PRIME DP - Unbound Medicine ER -