Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
MMWR Morb Mortal Wkly Rep. 2018 Jun 8;67(22):634-642. doi: 10.15585/mmwr.mm6722a4.
The United States 2017-18 influenza season (October 1, 2017-May 19, 2018) was a high severity season with high levels of outpatient clinic and emergency department visits for influenza-like illness (ILI), high influenza-related hospitalization rates, and elevated and geographically widespread influenza activity across the country for an extended period. Nationally, ILI activity began increasing in November, reaching an extended period of high activity during January-February, and remaining elevated through March. Influenza A(H3N2) viruses predominated through February and were predominant overall for the season; influenza B viruses predominated from March onward. This report summarizes U.S. influenza activity* during October 1, 2017-May 19, 2018..
美国 2017-18 流感季（2017 年 10 月 1 日-2018 年 5 月 19 日）为高严重性季节，因流感样疾病（ILI）到门诊和急诊就诊的人数较多，流感相关住院率较高，且流感活动在全国范围内持续长时间处于高发且地域广泛状态。全国范围内，ILI 活动于 11 月开始增加，1 月至 2 月期间达到长时间的高活动水平，直至 3 月仍保持较高水平。甲型 H3N2 病毒在 2 月前占主导地位，且在整个季节中总体占主导地位；乙型病毒从 3 月开始占主导地位。本报告总结了 2017 年 10 月 1 日至 2018 年 5 月 19 日期间美国的流感活动情况。
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