|
|||||
|
|
Possible circulation of H5N1 avian influenza viruses in healthy ducks on farms in northern Vietnam |
|
| Authors: | Hiroki Takakuwa Tetsu Yamashiro Mai Q. Le Lien S. Phuong Hiroichi Ozaki Ryota Tsunekuni Tatsufumi Usui Hiroshi Ito Tsuyoshi Yamaguchi Toshihiro Ito Toshiyuki Murase Etsuro Ono Koichi Otsuki |
| Affiliation: | Avian Influenza Research Centre, Kyoto Sangyo University, Kamigamo-Motoyama, Kita, Kyoto 603-8555, Japan;Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan;Department of Virology, National Institute of Hygiene and Epidemiology, 1 Yersin, Hanoi, Vietnam;Vietnam Veterinary Association, 86 Truong Chinh, Hanoi, Vietnam;The Avian Zoonosis Research Center, Faculty of Agriculture, Tottori University, 4-101 Koyama, Tottori 680-8553, Japan;Department of Veterinary Microbiology, Faculty of Agriculture, Tottori University, 4-101 Koyama, Tottori 680-8553, Japan;Department of Veterinary Public Health, Faculty of Agriculture, Tottori University, 4-101 Koyama, Tottori 680-8553, Japan;Laboratory of Biomedicine, Center of Biomedical Research, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi, Fukuoka 812-8582, Japan;Faculty of Technology, Kyoto Sangyo University, Kamigamo-Motoyama, Kita, Kyoto 603-8555, Japan |
| Abstract: | To estimate the prevalence of influenza A subtype H5N1 viruses among domestic ducks in the period between October and November 2006 when H5N1 outbreaks had been absent, 1106 healthy ducks raised in northern Vietnam were collected. Inoculation of all throat and cloacae samples into embryonated eggs resulted in the isolation of subtype H3N8 in 13 ducks, but not H5N1 viruses. Serological analyses demonstrated that five ducks (0.45%) solely developed H5N1 subtype-specific hemagglutinin-inhibiting and neuraminidase-inhibiting antibodies together with anti-non-structural protein 1 antibodies. The results suggested that the ducks were naturally infected with H5N1 viruses when obvious H5N1 outbreaks were absent. |
| Keywords: | antibody duck H5N1 non-structural protein 1 |