Analysis of Clinical Features of Pandemic 2009 Influenza A(H1N1)

　Clinical features of the pandemic 2009 H1N1　virus infection have been reported mainly in hospitalized　patients. We conducted a study using selfreported　clinical records of outpatients to analyze　their clinical features from November 1, 2009 to February 28, 2010 at Kimura Children and Family　Clinic in Izumo, Shimane. A total of 157 records　was completed and analyzed. Antiviral treatment　with neuraminidase inhibitors was administered to　146 patients（93%）. The durations of fever exceeding 37.5 ℃ and 38.0 ℃ were 1.5 and 1.1 days,　respectively. Fever duration was shorter in patients　above 13 years of age（p<0.05）. Cough was a　prominent feature of the infection. Delirious behaviors　were observed in 15% of the patients, similar to those observed for seasonal influenza. Our findings　suggest that 2009 H1N1 virus infection was　mild in outpatients. The mild clinical course may　permit individualized treatment, not with uniform　use of antiviral drugs.