title: Update: influenza activity - United States, September 29-December 7, 2013.
abstract: 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 continued to increase from mid-November through the beginning of December. This report summarizes U.S. influenza activity* during September 29-December 7, 2013.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000494:pharmacology; D002648:Child; D002675:Child, Preschool; D024882:Drug Resistance, Viral; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D053118:Influenza A Virus, H1N1 Subtype / Q000187:drug effects / Q000302:isolation & purification*; D053122:Influenza A Virus, H3N2 Subtype / Q000187:drug effects / Q000302:isolation & purification*; D009981:Influenza B virus / Q000302:isolation & purification; D007251:Influenza, Human / Q000150:complications / Q000453:epidemiology* / Q000401:mortality / Q000821:virology; D008297:Male; D008875:Middle Aged; D011014:Pneumonia / Q000150:complications / Q000401:mortality; D011159:Population Surveillance; D011247:Pregnancy; D012621:Seasons; D014481:United States / Q000453:epidemiology; D055815:Young Adult
chemical_list: D000998:Antiviral Agents