▲美国今年3月首度在乳牛身上发现H5N1病毒。
美国最新研究发现,老鼠喝下「感染禽流感乳牛」分泌的生乳之后,体内多个器官验出大量病毒。此实验结果显示,若饮用染疫且未杀菌的生乳,可能带来风险。这篇论文24日被发表在《新英格兰医学杂志》。
来自威斯康辛大学麦迪逊分校、德州农工大学的研究人员指出,随着禽流感疫情持续,人们越来越担心H5N1病毒进入人类食物链。因此,他们为了评估H5N1病毒检测结果呈阳性的牛乳,对于人类与其他动物造成的风险,进行了这次实验。
研究团队观察到,5只老鼠被喂食「染疫乳牛」分泌的生乳之后,都出现嗜睡等染疫症状,它们4天后被安乐死以进行器官研究,结果多个器官验出H5N1病毒,其中鼻腔、气管、肺部含量较高,其他器官含量中等或较低。
研究团队指出,带有高致病性禽流感H5N1病毒的生乳,若未经处理将带来风险,但在该实验室灭菌条件下,病毒含量大幅降低。
禽流感病毒H5N1最早出现于1996年,但自2020年以来,鸟类病例呈指数级成长,当年就导致数千万只家禽死亡或遭扑杀,如今哺乳动物感染情况也在增加,美国今年3月首度在乳牛身上发现禽流感病毒,截至5月已经确认2起人类接触乳牛而染疫的病例,全美9州也有52个牛群出现禽流感疫情。
尽管目前未发现H5N1「人传人」的情况与证据,但世界卫生组织(WHO)对此表达担忧。疾管署也建议,尽管目前国内无出现此疫情,仍呼吁民众切勿饮用未经杀菌处理的生乳。
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