【新朋友】点击标题下面蓝字【可可英语】加关注【老朋友】点击手机右上角图标【转发分享】内容【听音频，也可猛戳左下角“阅读原文”】According to the CDC, there was widespread flu activity visible across all 50 US states by the end of December, a trend never before seen in the 13-year history of the current flu surveillance system.美国疾病控制与预防中心表示，截至12月底，全美50个州都有广泛的流感活动，这个趋势目前的流感监测系统13年来从未遇到过。The seasonal flu vaccine, though not always 100% effective, still tends to weaken the severity of a bout of flu.季节性流感疫苗虽然不是100%有效，但仍然会减弱流感发作的严重程度。It also saves lives as a 2015 study by the CDC finds that seasonal flu shots had prevented at least 40,000 deaths from 2005
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