[Epidemiological aspects of influenza infections in the years 1967-1969].
D000906:Antibodies / Q000032:analysis*; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology
D000906:Antibodies
Aspecte epidemiologice ale infecţiilor gripale în anii 1967-1969.