挪威当局已确认欧洲首例北极熊禽流感病例，该病例在北极斯瓦尔巴群岛地区被发现。H5N5病毒变种也出现在一头于五月中旬死亡的海象身上，这两种病例均被怀疑是死亡原因。这一发现是禽流感传播到哺乳动物并到达北极等新地区这一更广泛趋势的一部分，可能影响脆弱的种群和生态系统。 AI
排序理由 该集群报告了一项关于病毒传播到新物种和新地区的科学发现。[lever_c_demoted from research: ic=1 ai=0.0]
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Norwegian authorities on Tuesday announced that bird flu has been documented in a polar bear for the first time in Europe, in the Svalbard region in the Arctic. The H5N5 variant of the virus was detected in samples taken from a male bear about one year old and a walrus found dead…