New influenza   A (H1N1) virus: global   epidemiological situation,   June 2009.
D000293:Adolescent; D000328:Adult; D002675:Child, Preschool; D004196:Disease Outbreaks; D005260:Female; D014943:Global Health; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D055815:Young Adult