[Influenza; epidemiologic research in Switzerland in the period from 1952-1955].
D016021:Epidemiologic Studies; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D013557:Switzerland
INFLUENZA/epidemiology
Influenza:  Epidemiologische Untersuchungen in der Schweiz im Zeitraum 1952-1955.