tetano
Editor, Senior Moderator
J Gen Virol. 2011 Nov 23. [Epub ahead of print]
Reintroduction of H5N1 highly pathogenic avian influenza virus by migratory water birds, causing poultry outbreaks in 2010-2011 winter season in Japan.
Sakoda Y, Ito H, Uchida Y, Okamatsu M, Yamamoto N, Soda K, Nomura N, Kuribayashi S, Shichinohe S, Sunden Y, Umemura T, Usui T, Ozaki H, Yamaguchi T, Murase T, Ito T, Saito T, Takada A, Kida H.
Source
Hokkaido University;
Abstract
H5N1 highly pathogenic avian influenza virus (HPAIV) was reintroduced and caused outbreaks in chickens in 2010-2011 winter season in Japan, that had been free from highly pathogenic avian influenza (HPAI) since 2007 when HPAI outbreaks occurred and were controlled. On October 14, 2010 at Lake Ohnuma, Wakkanai, the northernmost part of Hokkaido, Japan, H5N1 HPAIVs were isolated from fecal 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 9 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 3 groups, suggesting that the viruses were transmitted by migratory water birds through at least 3 different routes from their northern territory to Japan. These isolates were antigenic variants, which is consistent with the 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 the HPAI has not been controlled.
PMID:
22113008
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22113008
Reintroduction of H5N1 highly pathogenic avian influenza virus by migratory water birds, causing poultry outbreaks in 2010-2011 winter season in Japan.
Sakoda Y, Ito H, Uchida Y, Okamatsu M, Yamamoto N, Soda K, Nomura N, Kuribayashi S, Shichinohe S, Sunden Y, Umemura T, Usui T, Ozaki H, Yamaguchi T, Murase T, Ito T, Saito T, Takada A, Kida H.
Source
Hokkaido University;
Abstract
H5N1 highly pathogenic avian influenza virus (HPAIV) was reintroduced and caused outbreaks in chickens in 2010-2011 winter season in Japan, that had been free from highly pathogenic avian influenza (HPAI) since 2007 when HPAI outbreaks occurred and were controlled. On October 14, 2010 at Lake Ohnuma, Wakkanai, the northernmost part of Hokkaido, Japan, H5N1 HPAIVs were isolated from fecal 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 9 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 3 groups, suggesting that the viruses were transmitted by migratory water birds through at least 3 different routes from their northern territory to Japan. These isolates were antigenic variants, which is consistent with the 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 the HPAI has not been controlled.
PMID:
22113008
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22113008