DURATION OF IMMUNITY FOLLOWING MODERN SMALLPOX VACCINE INOCULATION
American journal of public healthPublished 1 September 1927Open access
Allen F. Gillihan
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TL;DR
Obs observations during the past century in Europe tend to show that three successful immunizations at different age periods, as, for instance, the first during the first year of life, the second on entering school at about 7 years, and the third during adolescence, have rendered the great mass of such people immune for life.
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Social Sciences