[VARIATIONS OF INFLUENZA VIRUSES A AND B AND THEIR ROLE IN EPIDEMICS].
D004813:Epidemiology; D006801:Humans; D007251:Influenza, Human; D009975:Orthomyxoviridae; D015022:Yugoslavia
EPIDEMIOLOGY; INFLUENZA; INFLUENZA VIRUSES; YUGOSLAVIA
VARIJACIJE VIRUSA INFLUENCE A I B I NJIHOV ODRAZ NA EPIDEMIJE.