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总结
美国疾控中心（CDC）数据显示，本季流感活动在全美范围处于较高水平，累计病例至少达1800万例，并使多地门急诊就诊与住院压力上升。多家媒体称一种新的流感病毒变异株可能推动美国及加拿大病例激增，加州等地病例攀升引发官方警示。在流感与新冠、RSV等呼吸道病毒并行传播背景下，卫生部门呼吁接种疫苗、加强防护并在症状加重时及时就医。
正文
Flu activity elevated across the US with at least 18 million cases: CDC ABC News U.S. reports over 18 million flu cases this season news.cgtn.com New variant of the flu virus is driving surge of cases across the US and Canada The Conversation Flu cases surging in California as officials warn of powerful virus strain Los Angeles Times There's 'super flu,' COVID, RSV. Is it going around in SoCal? USA Today
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