RT Journal Article SR Electronic(1) A1 Sakoda, Yoshihiro A1 Ito, Hiroshi A1 Uchida, Yuko A1 Okamatsu, Masatoshi A1 Yamamoto, Naoki A1 Soda, Kosuke A1 Nomura, Naoki A1 Kuribayashi, Saya A1 Shichinohe, Shintaro A1 Sunden, Yuji A1 Umemura, Takashi A1 Usui, Tatsufumi A1 Ozaki, Hiroichi A1 Yamaguchi, Tsuyoshi A1 Murase, Toshiyuki A1 Ito, Toshihiro A1 Saito, Takehiko A1 Takada, Ayato A1 Kida, HiroshiYR 2012 T1 Reintroduction of H5N1 highly pathogenic avian influenza virus by migratory water birds, causing poultry outbreaks in the 2010–2011 winter season in Japan JF Journal of General Virology, VO 93 IS 3 SP 541 OP 550 DO https://doi.org/10.1099/vir.0.037572-0 PB Microbiology Society, SN 1465-2099, AB H5N1 highly pathogenic avian influenza virus (HPAIV) was reintroduced and caused outbreaks in chickens in the 2010–2011 winter season in Japan, which had been free from highly pathogenic avian influenza (HPAI) since 2007 when HPAI outbreaks occurred and were controlled. On 14 October 2010 at Lake Ohnuma, Wakkanai, the northernmost part of Hokkaido, Japan, H5N1 HPAIVs were isolated from faecal samples of ducks flying from their nesting lakes in Siberia. Since then, in Japan, H5N1 HPAIVs have been isolated from 63 wild birds in 17 prefectures and caused HPAI outbreaks in 24 chicken farms in nine prefectures by the end of March in 2011. Each of these isolates was genetically closely related to the HPAIV isolates at Lake Ohnuma, and those in China, Mongolia, Russia and Korea, belonging to genetic clade 2.3.2.1. In addition, these isolates were genetically classified into three groups, suggesting that the viruses were transmitted by migratory water birds through at least three different routes from their northern territory to Japan. These isolates were antigenic variants, which is consistent with selection in poultry under the immunological pressure induced by vaccination. To prevent the perpetuation of viruses in the lakes where water birds nest in summer in Siberia, prompt eradication of HPAIVs in poultry is urgently needed in Asian countries where HPAI has not been controlled., UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/vir.0.037572-0