HPAI_Publications

1. Genetic Analysis of an H5N2 Highly Pathogenic Avian Influenza Virus Isolated from a Chicken in a Live Bird Market in Northern Vietnam in 2012.

Nishi T, Okamatsu M, Sakurai K, Chu HD, Thanh LP, VAN Nguyen L, VAN Hoang N, Thi DN, Sakoda Y, Kida H. J Vet Med Sci. 2013 Aug 27. [Epub ahead of print]

Abstract

In August 2012, an H5N2 highly pathogenic avian influenza virus was isolated from a chicken in a live bird market (LBM) in Northern Vietnam. The gene segments of the isolate were phylogenetically closely related to those H5N2 virus of clade 2.3.2.1 and H9N2 viruses, which were isolated from birds in LBMs in the same province. These results indicate that this H5N2 virus is a genetic reassortant and that surveillance of avian influenza in LBMs and stamping out policy are essential for the eradication of highly pathogenic avian influenza viruses from Asia.

Full text for this publication can be found at <http://www.ncbi.nlm.nih.gov/pubmed/23986117>.


2. The genetic and antigenic diversity of avian influenza viruses isolated from domestic ducks, muscovy ducks, and chickens in northern and southern Vietnam, 2010-2012.

Okamatsu M, Nishi T, Nomura N, Yamamoto N, Sakoda Y, Sakurai K, Chu HD, Thanh LP, Van Nguyen L, Van Hoang N, Tien TN, Yoshida R, Takada A, Kida H. Virus Genes. 2013 Oct;47(2):317-29.

Abstract

To estimate the prevalence of avian influenza virus infection in Vietnam, surveillance was conducted in domestic and wild birds from households, live-bird markets, slaughtering sites, and bird sanctuaries in Vietnam between October 2010 and October 2012. Of the 4,550 samples collected, 226 influenza A virus isolates were obtained from domestic ducks, muscovy ducks, and chickens. Of these, 25 and 22 H5N1 highly pathogenic avian influenza viruses (HPAIVs) were isolated from apparently healthy domestic ducks in live-bird markets and slaughtering sites in northern and southern Vietnam, respectively. Phylogenetic analyses of internal gene segments of these isolates revealed that these viruses were circulating in both domestic and wild birds in Asia and reassortment events had occurred frequently. 

Full text for this publication can be found at <http://www.ncbi.nlm.nih.gov/pubmed/23861018>


3. Characterization of avian influenza viruses isolated from domestic ducks in Vietnam in 2009 and 2010.

Nomura N, Sakoda Y, Endo M, Yoshida H, Yamamoto N, Okamatsu M, Sakurai K, Hoang NV, Nguyen LV, Chu HD, Tien TN, Kida H. Arch Virol. 2012 Feb;157(2):247-57.

Abstract 

In the surveillance of avian influenza in Vietnam, 40 avian influenza viruses were isolated from tracheal and cloacal swab samples of 600 domestic ducks in April 2009 and March 2010. Out of the 27 H9 virus isolates, the hemagglutinins of 18 strains were genetically classified as belonging to the sublineage G1, and the other nine belonged to the Korean sublineage. On the basis of experimental infection studies, it was found that each of the three viruses readily infected pigs and replicated in their upper respiratory tracts, and they infected chickens with slight replication. Viruses were recovered from the lungs of mice inoculated with two of the three isolates. The present results reveal that H9 avian influenza viruses are prevailing in domestic ducks in Vietnam. It is recommended that careful surveillance of swine influenza with H9 viruses should be performed to prepare for pandemic influenza.

Full text for this publication can be found at <http://www.ncbi.nlm.nih.gov/pubmed/22068881>

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