We found common clinical features for all patients with the pandemic H1N1 2009 influenza virus infection in the present study, which included a high fever with accompanying symptoms of cough, rhinorrhea, sore throat, myalgia, or gastrointestinal symptoms such as vomiting or diarrhea. These findings are similar to the symptoms of other influenzas (8) and those found in previous studies that dealt with unspecified populations (3, 5, (9) (10) (11) (12) (13) .