THE PROTECTIVE EFFECT OF VACCINATION AGAINST EPIDEMIC INFLUENZA B

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Abstract
DISTRIBUTION OF INFLUENZA B IN 1945 The epidemiologic pattern of influenza B has not been well established. In some years in certain areas it has presented the picture of a sharp short epidemic similar to that usually seen with influenza. A. This was the case in 1936 and 1940, the first epidemics identified as influenza B.1 Since 1940, however, several investigators have called attention to the fact that the disease may occur in a scattered manner during the respiratory disease season, independent of or interspersed with influenza A.2 In the past three years members of the Commission on Influenza of the Army Epidemiological Board have maintained a continuous alert for the detection of outbreaks of respiratory disease and their identification.3 This has consisted in serologic sampling of common respiratory infection in different service commands and prompt exploration of any increased prevalences. The activities of the commission have