Reasonably accurate data are now available from which it is possible to make a rough estimate of the extent of vaccination in the United States. A nationwide survey,1 which included 9,000 families in 130 localities in eighteen states, was made over a twelve months period. Thirty-nine thousand persons in every size of community were represented in the group. While it is natural that the statistics resulting from this study cannot be projected to the whole population, a definite effort was made to have the group entirely representative in all factors. The proportion of persons of different ages who gave a history of vaccination within seven years of the date of interview varied, according to Collins, from a maximum of 60 per cent at 10 years of age to 23 per cent at 20 to 24 years and 16 per cent at 25 to 34 years. The decline occurred at
THE FREQUENCY OF SMALLPOX AND SMALLPOX VACCINATION. JAMA. 1936;106(24):2070–2071. doi:10.1001/jama.1936.02770240034013
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