Molecular epidemiology--influenza as archetype.
D000818:Animals; D004196:Disease Outbreaks; D004813:Epidemiology; D006801:Humans; D007251:Influenza, Human / Q000276:immunology / Q000382:microbiology*; D009154:Mutation; D009975:Orthomyxoviridae / Q000502:physiology; D014779:Virus Replication