Update: Influenza Activity - United States, September 28- December 6, 2014

MMWR Morb Mortal Wkly Rep. 2014 Dec 19;63(50):1189-94.


CDC collects, compiles, and analyzes data on influenza activity year-round in the United States (http://www.cdc.gov/flu/weekly/fluactivitysurv.htm). 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 increased starting mid-October through December. This report summarizes U.S. influenza activity during September 28-December 6, 2014.

MeSH terms

  • Humans
  • Influenza A Virus, H1N1 Subtype / isolation & purification*
  • Influenza A Virus, H3N2 Subtype / isolation & purification*
  • Influenza B virus / isolation & purification*
  • Influenza, Human / epidemiology*
  • Population Surveillance*
  • Seasons
  • United States / epidemiology