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2009年3月中旬,流行性感冒(流感)发病已到了下降季节,墨西哥卫生部确认的流感样病例数却异常增加,到4月中旬,各地区既往健康的青壮年人群中出现了群体性严重肺部疾患典型病例,作为应对,墨西哥全国加强了监测工作。2009年3月底,美国南加利福尼亚州的2名邻县儿童发生了急性发热性
In mid-March 2009, the incidence of influenza (influenza) had reached a declining season. However, the number of influenza-like illness confirmed by the Mexican Ministry of Health increased abnormally. By mid-April, there was a serious group of young and middle-aged people in all the regions As a typical case of lung disease, Mexico has stepped up its monitoring efforts throughout the country. By the end of March 2009, two neighboring counties in southern California in the United States had an acute febrile illness