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总结
美国本季流感活动持续攀升。媒体称一种传播更快的“超级流感”毒株导致就诊与感染人数增加，CDC估计全美累计至少1500万例，并提示本轮流感季可能尚未见顶。多家报道指出部分流感症状表现出现变化，儿童群体受影响尤为明显。报道同时聚焦本年度流感疫苗对当前流行株的保护效果，以及是否能降低重症、住院与死亡风险，引发公众对接种与防护的关注。
正文
A 'super flu' strain is making everyone sick. Is this year's vaccine effective? NJ.com Flu activity continues to climb in US with at least 15 million cases: CDC abcnews.go.com CDC says flu activity probably has not peaked amid record-breaking season CNN Some flu symptoms are changing as a new variant spreads rapidly. What to expect NBC 5 Chicago Flu is particularly hard on kids this season NBC News
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