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Isolation and characterization of H6N1 and H9N2 avian influenza viruses from Ducks in Hanoi, Vietnam |
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| Authors: | Hotta Kozue Takakuwa Hiroki Le Quynh Mai Thi Phuong Song Lien Murase Toshiyuki Ono Etsuro Ito Toshihiro Otsuki Koichi Yamashiro Tetsu |
| Institution: | a Center for Infectious Disease Research in Asia and Africa, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan b Vietnam Research Station, Nagasaki University, c/o National Institute of Hygiene and Epidemiology, No. 1 Yersin Street, Hanoi, Viet Nam c Avian Influenza Research Center, Kyoto Sangyo University, Kamigamo-motoyama, Kita, Kyoto 603-8555, Japan d Department of Virology, National Institute of Hygiene and Epidemiology, No. 1 Yersin, Hanoi, Viet Nam e Vietnam Veterinary Association, No. 86 Truong Chinh, Hanoi, Viet Nam f Faculty of Agriculture, Tottori University, 4-101 Koyama, Tottori 680-8553, Japan g Laboratory of Biomedicine, Center of Biomedical Research, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan |
| Abstract: | 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. |
| Keywords: | Avian influenza viruses H6N1 H9N2 LPAI Vietnam Molecular epidemiology |
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