The near-perfect effectiveness of mass vaccinations against poliomyelitis has been dramatically proved in figures just released by the Center for Disease Control: in 1969, there were only 19 cases of paralytic polio in the U.S., and not a single death. It was the first year without a polio fatality in the half century since records have been kept, and probably since 1894, when the disease was first recognized in the U.S. By contrast, in 1952just before the first Salk vaccine became generally available3,145 deaths were reported, and 21,269 additional victims suffered varying degrees...
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