An influenza epidemic in Medan.
D004196:Disease Outbreaks; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007214:Indonesia; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology; D009975:Orthomyxoviridae / Q000302:isolation & purification; D010614:Pharynx / Q000382:microbiology; D011309:Preservation, Biological