title: Update: influenza activity - United States, September 28, 2008--January 31, 2009.
abstract: From September 28, 2008, to January 31, 2009, influenza activity remained low in the United States but began to increase at the end of January. Thus far during the 2008-09 influenza season, influenza A viruses have predominated and are antigenically related to the 2008-09 influenza vaccine strains. Oseltamivir resistance has been detected in nearly all of the influenza A (H1N1) viruses tested so far during the 2008-09 season, with high levels of adamantane resistance among influenza A (H3N2) viruses. This report summarizes U.S. influenza activity since the last update and reviews interim recommendations for the use of influenza antiviral medications.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000494:pharmacology*; D002648:Child; D024882:Drug Resistance, Viral; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; 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 / Q000187:drug effects / Q000302:isolation & purification; D007251:Influenza, Human / Q000188:drug therapy* / Q000453:epidemiology*; D008875:Middle Aged; D011014:Pneumonia / Q000401:mortality; D011159:Population Surveillance; D014481:United States / Q000453:epidemiology; D055815:Young Adult
chemical_list: D000998:Antiviral Agents