Influenza; a laboratory study of the influenza epidemic which occurred in South Africa in the winter of 1950.
D058872:Epidemics; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000706:statistics & numerical data*; D012106:Research; D012621:Seasons; D013019:South Africa
INFLUENZA/epidemiology and statistics