CDC collects, compiles, and analyzes data on influenza activity year-round in the United States. The influenza season generally begins in the fall and continues through the winter and spring months; however, the timing and severity of circulating influenza viruses can vary by geographic location and season. Influenza activity in the United States remained low through October and November in 2015. Influenza A viruses have been most frequently identified, with influenza A (H3) viruses predominating. This report summarizes U.S. influenza activity for the period October 4-November 28, 2015.
Smith S, Blanton L, Kniss K, Mustaquim D, Steffens C, Reed C, Bramley A, Flannery B, Fry AM, Grohskopf LA, Bresee J, Wallis T, Garten R, Xu X, Elal AI, Gubareva L, Barnes J, Wentworth DE, Burns E, Katz J, Jernigan D, Brammer L. (2015). Update: Influenza Activity - United States. MMWR. Morbidity and mortality weekly report, 64(48)