[Epidemiology of virus influenza 1957/1958 in the North Rhine and Westphalia areas. II].
D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D009975:Orthomyxoviridae
INFLUENZA/epidemiology
Zur Epidemiologie der Virus-Grippe 1957/1958 im Land Nordrhein-Westfalen. II.