title: Update: influenza activity--United States and worldwide, May 20-September 15, 2007.
abstract: During May 20-September 15, 2007, influenza A (H1), influenza A (H3), and influenza B viruses cocirculated worldwide and were identified sporadically in the United States. This report summarizes influenza activity in the United States and worldwide since the last MMWR update.
mesh_terms: D014943:Global Health; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D053122:Influenza A Virus, H3N2 Subtype; D053124:Influenza A Virus, H5N1 Subtype; D009981:Influenza B virus; D007251:Influenza, Human / Q000453:epidemiology*; D011159:Population Surveillance; D014481:United States / Q000453:epidemiology