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Avian Influenza - Wiley Online Library

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Last Updated: 08 November 2022

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Evolutionary dynamics of the clade 2.3.4.4B H5N8 high‐pathogenicity avian influenza outbreaks in coastal seabirds and other species in southern Africa from 2017 to 2019

The South African coastal seabird viruses, according to phylogenetic studies of the full viral genomes and time to the most recent common ancestor analyses of the HA, NA, PB1, and PA genes, formed a monophyletic group nested within the South African genotype 4 viruses. Only the HA and NA sequences were available for the Namibian penguin viruses, but the most closely related South African coastal seabird viruses were found in a gull, according to phylogenetic results, the source and the most closely related South African coastal seabird virus was found in a gull. The progenitors of the five genotypes linked to the outbreaks in wild birds and poultry in the earlier 2017 South African outbreaks of wild birds and poultry were estimated between 2 and four months before the index cases were confirmed, according to tMRCA findings, which were more precise.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/tbed.14744


Evidence for human infection with avian influenza A(H9N2) virus via environmental transmission inside live poultry market in Xiamen, China

The H9N2 avian influenza virus has become widespread in the live poultry industry around the world, and the environmental transmission method is a common way for AIVs to infect human beings in the LPM. We investigated one human isolate and three environmental isolates inside LPMs in Xiamen, China, in the hopes of finding evidence of human infection with the influenza A virus via environmental contamination. Environmental exposure may be a common source of human infection in LPMs, according to this report.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/jmv.28242


Avian influenza overview June – September 2022

The 2021-2022 highly pathogenic avian influenza epidemic in Europe is the first HPAI virus epidemic to have contaminated poultry, 47. 7 million birds culled in the affected facilities, 187 outbreaks in captive birds, and 3,573 HPAI virus outbreaks in wild birds, affecting 37 European countries. Several colonies of Europe's northwest coast were plagued by HPAI A virus widespread and fatalities. This resulted in unprecedentedly high rate of HPAI virus infections in wild birds between June and August 2022, indicating an ongoing threat to domestic birds. HPAI A viruses were also present in wild mammal species in Europe and North America, and they displayed genetic signatures of migration to reproduce in mammals.

Source link: https://onlinelibrary.wiley.com/doi/10.2903/j.efsa.2022.7597


H6N8 avian influenza virus in Antarctic seabirds demonstrates connectivity between South America and Antarctica

Wild aquatic birds are the natural reservoirs of avian influenza viruses. By RTu2010PCR, thirteen swab samples were AIV positive, and complete genome sequences of H6N8 AIVs isolated from brown skua and chinstrap penguin were collected in 2011. In Antarctica and interspecies viral transmission in the subtropical zone, with the prevalence with which we found evidence for AIVs infection in many Antarctic seabirds suggests viral transmission in Antarctic avifauna and interspecies viral transmission in the sub-utarctic zone.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/tbed.14728


Two major epidemics of highly pathogenic avian influenza virus H5N8 and H5N1 in domestic poultry in France, 2020–2022

The outbreak of highly pathogenic avian influenza viruses around the world has significant implications on animal health and a major economic impact on the poultry industry. We investigated the spatio-temporal transmission of outbreaks in France between 2021 and 2021 in 2020, 2021, u201322, and 2021 u201322, and we analyzed the outbreaks and locations, u2019 spatial distribution in connection with the 2016u201317 epidemic and the two u2013highest risk zones,'u20191u2019. h12019 was recently integrated into French laws to improve HPAI prevention and monitoring. The virus was circulating within farms at high rates as soon as it hit the high-risk zones, with each infected farm infecting between two and three other farms during peak transmission. The spatial distribution model used to create the two high risk zones in the 2020u201321 and 2021u201322 epidemics was able to pinpoint outbreak locations for the 2020-21 and 2021u201322 epidemics, according to Weisser.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/tbed.14722

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions