本文分析了2013年12月2日至2014年1月23日美国流行性感冒(流感)流行情况,并对流感疫苗保护效果进行评估,对我国流感疫情防控具有参考价值。虽然同期我国流感H3N2较多,世界卫生组织(WHO)也有资料表明H3N2在欧洲等地活跃,而乙型流感很少。美国每年对年龄≥6个月的所有人群推荐接种季节性流感疫苗。自从2004 2005年以来每个流感季节,美国疾病预防控制中心(CDC)都对季节性 This article analyzes the prevalence of influenza (influenza) in the United States from December 2, 2013 to January 23, 2014 and evaluates the effectiveness of influenza vaccine protection, which is of reference value for the prevention and control of influenza in China. Although there are more H3N2 cases in our country during the same period, the World Health Organization (WHO) has also shown that H3N2 is active in Europe and other places with very few Influenza B cases. The United States recommends seasonal flu vaccinations to all people over 6 months each year. Since every flu season in the United States since 2004, the Centers for Disease Control and Prevention (CDC)