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In page Influenza A virus subtype H5N1:

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*H5N1, ("bird flu"), which is noted for having a strain (Asian-lineage HPAI H5N1) that kills over half the humans it infects, infecting and killing species that were never known to suffer from influenza viruses before (e.g. cats), being unable to be stopped by culling all involved poultry—some think due to being endemic in wild birds, and causing billions of dollars to be spent in flu pandemic preparation and preventiveness