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Systemic infection with highly pathogenic H5N8 of avian origin produces encephalitis and mortality in wild mammals at a UK rehabilitation centre

Floyd, T.; Banyard, A. C.; Lean, F. Z.; Byrne, A. M.; Fullick, E.; Whittard, E.; Mollet, B. C.; Bexton, S.; Swinson, V.; Macrelli, M.; Lewis, N. S.; Reid, S. M.; Nunez, A.; Duff, J. P.; Hansen, R.; Brown, I. H.

2021-05-26 microbiology
10.1101/2021.05.26.445666 bioRxiv
Show abstract

Europe has experienced extensive outbreaks of highly pathogenic avian influenza (HPAI) during the autumn/winter 2020/21 season. These avian influenza A viruses are highly transmissible and have infected over 1000 commercial and backyard poultry premises in Europe in this period causing high mortality. The impact on wild bird populations has also been significant, with over 400 detections in at least 47 different species reported across Europe as being positive with the H5N8 virus. Although different H5Nx combinations within the H5 clade 2.3.4.4b have been detected, the H5N8 subtype has predominated both in wild birds and domestic poultry outbreaks. In the UK there have been 22 outbreaks of H5N8 in domestic poultry and captive birds and more than 300 wild bird detections involving H5N8 over the autumn/winter 2020/21 period to April 2021. Here we detail the series of events surrounding the detection of an H5N8 influenza A virus of avian origin in five swans, a fox and three seals in a wildlife rehabilitation centre.

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