美國愛荷華布宜納維斯塔(Buena Vista County) 上周才傳出首波H5N2型禽流感疫情,一火雞場發現有2萬7千隻火雞感染禽流感,隨後已全被撲殺,20日在愛荷華州奧西歐拉(Osceola County)一家養雞場也確認出現H5N2型禽流感,為防止疫情蔓延,將撲殺養雞場內所有雞隻,估計約有530萬隻母雞。自去年12月以來,美國已有13個州發現共計近800萬例H5N2型禽流感疫情,其中威斯康辛州宣佈進入緊急狀態。
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