One hundred thirty-eight subjects with confirmed influenza A and 58 with confirmed influenza B were recruited in the IRIS in 2010, including 43% aged ,15 years (range, 2-85 years); 53% were female, and 53% were prescribed oseltamivir treatment. One hundred eighty-eight subjects with confirmed influenza A and 118 with confirmed influenza B were recruited into the HTS in 2008, of whom 73% were aged ,15 years (range, 0-79 years); 54% were female, and 25% were prescribed oseltamivir treatment. The demographic characteristics of subjects with influenza A versus B were similar. Oseltamivir treatment was more common during the period of peak pandemic A (H1N1) activity (data not shown).