The Journal of Experimental Medicine
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The Journal of Experimental Medicine, Vol 80, 265-273, Copyright, 1944, by The Rockefeller Institute for Medical Research New York

ARTICLE

STUDIES IN HUMAN IMMUNIZATION AGAINST INFLUENZA : DURATION OF IMMUNITY INDUCED BY INACTIVE VIRUS



G. K. Hirst M.D.1, E. R. Rickard M.D.1, and W. F. Friedewald M.D.1

1 From the Laboratories of the International Health Division of The Rockefeller Foundation, New York

The administration to human beings of formalin-killed influenza virus, concentrated from allantoic fluid, resulted in a high order of antibody response within 2 weeks after injection. Even after 1 year the great majority of individuals vaccinated had antibody levels considerably above their prevaccination titer for the PR8, Lee, and a current 1943 strain. An investigation of the occurrence of epidemic influenza A in seven widely separated populations, 1 year after vaccination of part of these groups, showed that the attack rate among vaccinated persons was consistently lower than that of control individuals. The average reduction in attack rate was of the order of 35 per cent.

Submitted on June 23, 1944


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