Influenza virus A/environment/Gainesville/01/2014(H1N1) (GenBank KJ195790) was isolated from collection media used during air sampling of classroom air (J. Lednicky, unpublished). Viruses A/New York/39/2012 (H3N2), A/Texas/50/2012 (H3N2), and A/Switzerland/9715293/2013 (H3N2) were obtained from the American Type Culture Collection Influenza Reagent Resource (catalog numbers FR-1307, FR-1210, and FR-1368).