The first case in Japan of 2009 pandemic influenza A (H1N1) was reported in May, with pediatric hospitalization exceeding that of adults. We evaluated six adults hospitalized for 2009 H1N1 respiratory complications and compared the pandemic to seasonal influenza. Hospitalization was due to aggravated asthma in four of the six, two of whom had simultaneous pneumonia probably virus-caused, and two cases of bacterial pneumonia. Among the three seasons examined, the number of adults increased slightly but the hospitalization rate was low in 2009-2010. Respiratory complications such as viral pneumonia were not seen outside of 2009-2010. Attention should therefore be paid to respiratory complications in adults with pandemic 2009 influenza A (H1N1) virus.
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