MMWR Morb Mortal Wkly Rep. 2013 Jun 14;62(23):473-9.
During the 2012-13 influenza season in the United States, influenza activity* increased through November and December before peaking in late December. Influenza A (H3N2) viruses predominated overall, but influenza B viruses and, to a lesser extent, influenza A (H1N1)pdm09 (pH1N1) viruses also were reported in the United States. This influenza season was moderately severe, with a higher percentage of outpatient visits for influenza-like illness (ILI), higher rates of hospitalization, and more reported deaths attributed to pneumonia and influenza compared with recent years. This report summarizes influenza activity in the United States during the 2012-13 influenza season (September 30, 2012-May 18, 2013) as of June 7, 2013, and reports the recommendations for the components of the 2013-14 Northern Hemisphere influenza vaccine.
在 2012-13 年美国流感季节期间，流感活动在 11 月和 12 月间增加，然后在 12 月底达到高峰。甲型 H3N2 病毒总体上占主导地位，但乙型流感病毒和程度较轻的甲型 H1N1pdm09（pH1N1）病毒也在美国有报告。本流感季节为中度严重，因流感样疾病（ILI）就诊的门诊患者比例较高，住院率较高，与近年来相比，归因于肺炎和流感的死亡人数也有所增加。本报告总结了截至 2013 年 6 月 7 日 2012-13 年流感季节期间（2012 年 9 月 30 日至 2013 年 5 月 18 日）美国的流感活动情况，并报告了 2013-14 年北半球流感疫苗组分的建议。
