This map depicted the endemic distribution of the smallpox virus between the years of 1954 - 1957. The sources for this map were the World Health Organization (WHO) Bulletin, EB 21/WP/21, January 1958, Campaigns Against Smallpox, and the Pan American Sanitary Bureau (PASB), Scientific Publication, No. 40, June, 1958, Four Year Reports on Health Conditions in the Americas.
CDC/ Dr. Donaldson; World Health Organization; Pan American Sanitary Bureau
December 3, 2012
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