Observations during Hong Kong influenza epidemic.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D007223:Infant; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009518:New York