MMWR Morb Mortal Wkly Rep. 2010 Apr 16;59(14):423-30.
The emergence and spread of 2009 pandemic influenza A (H1N1) virus resulted in substantial influenza activity in the United States throughout the summer and fall months of 2009, with activity peaking in late October. Activity declined beginning in November 2009 but continued at lower levels through March 2010. The 2009 H1N1 virus remained the dominant circulating influenza virus throughout the season; <1% of characterized viruses were seasonal influenza A (H1), A (H3), and influenza B viruses. This report summarizes U.S. influenza activity from August 30, 2009, the start of the 2009-10 influenza season, through March 27, 2010, and also reports on the 2010-11 Northern Hemisphere influenza vaccine strain selection.
2009 年大流行性流感 A(H1N1)病毒的出现和传播导致 2009 年整个夏季和秋季美国的流感活动大幅增加,活动高峰出现在 10 月底。2009 年 11 月开始活动下降,但到 2010 年 3 月仍持续在较低水平。2009 年 H1N1 病毒在整个季节一直是主要的流行流感病毒;<1%的特征病毒为季节性流感 A(H1)、A(H3)和 B 型流感病毒。本报告总结了 2009 年 8 月 30 日(2009-10 年流感季节开始)至 2010 年 3 月 27 日期间美国的流感活动情况,并报告了 2010-11 年北半球流感疫苗株的选择情况。