TY - JOUR
T1 - Isolation and characterization of H6N1 and H9N2 avian influenza viruses from Ducks in Hanoi, Vietnam
AU - Hotta, Kozue
AU - Takakuwa, Hiroki
AU - Le, Quynh Mai Thi
AU - Phuong, Song Lien
AU - Murase, Toshiyuki
AU - Ono, Etsuro
AU - Ito, Toshihiro
AU - Otsuki, Koichi
AU - Yamashiro, Tetsu
N1 - Funding Information:
We thank staff of the Department of Virology, National Institute of Hygiene and Epidemiology for sample collection. We also thank Ms. Toshiyo Yabuta, Kyoto Sangyo University, and Ms. Ung Thi Hong Trang, Vietnam Research Station for their assistance. This work was supported by a Grant-in-Aid for Scientific Research (B) (20405043) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) and in part by the program of “Japan Initiative for Global Research Network on Infectious Diseases (J-GRID)” .
PY - 2012/2
Y1 - 2012/2
N2 - We report the genetic characterization of low pathogenic avian influenza (LPAI) viruses isolated from domestic ducks in northern Vietnam in 2009. In total, 22 influenza A viruses consisting of 21 H6N1 subtypes and one H9N2 subtype were isolated from 1488 ducks collected in February, March, and April 2009, accounting the overall virus isolation rate for 1.5%. No H5N1 strain was isolated in this study. Phylogenetic analysis indicated that all the eight genes of the H6N1 and H9N2 subtypes analyzed in this study were similar to those isolated in Korea, southeast China and northern Japan, and wild birds which migrate along the coastal East Asian Flyway are estimated to transmit these viruses. There was no evidence that the H6N1 and H9N2 subtypes share the gene segments with H5N1 subtypes. However, it is important to monitor the prevalence and genetical backgrounds of LPAI viruses among poultry in an area where several different influenza A subtypes are in circulation.
AB - We report the genetic characterization of low pathogenic avian influenza (LPAI) viruses isolated from domestic ducks in northern Vietnam in 2009. In total, 22 influenza A viruses consisting of 21 H6N1 subtypes and one H9N2 subtype were isolated from 1488 ducks collected in February, March, and April 2009, accounting the overall virus isolation rate for 1.5%. No H5N1 strain was isolated in this study. Phylogenetic analysis indicated that all the eight genes of the H6N1 and H9N2 subtypes analyzed in this study were similar to those isolated in Korea, southeast China and northern Japan, and wild birds which migrate along the coastal East Asian Flyway are estimated to transmit these viruses. There was no evidence that the H6N1 and H9N2 subtypes share the gene segments with H5N1 subtypes. However, it is important to monitor the prevalence and genetical backgrounds of LPAI viruses among poultry in an area where several different influenza A subtypes are in circulation.
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U2 - 10.1016/j.virusres.2011.11.004
DO - 10.1016/j.virusres.2011.11.004
M3 - Article
C2 - 22108585
AN - SCOPUS:84856538268
VL - 163
SP - 448
EP - 453
JO - Virus Research
JF - Virus Research
SN - 0168-1702
IS - 2
ER -
