MMWR Morb Mortal Wkly Rep. 2011 Dec 9;60(48):1646-9.
During October 2-November 26, 2011, influenza activity remained low in the United States. Thus far, influenza A viruses have predominated, and the majority are antigenically related to the 2011-12 influenza vaccine strains for the Northern Hemisphere. This report summarizes U.S. influenza activity since October 2 and updates the previous summary.
2011 年 10 月 2 日至 11 月 26 日期间，美国的流感活动仍然很低。到目前为止，甲型流感病毒占主导地位，且大多数与北半球 2011-2012 年流感疫苗株具有抗原相关性。本报告总结了自 10 月 2 日以来美国的流感活动情况，并更新了之前的总结。
