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Ann Intern Med. 1957;46(6):1214-1218. doi:10.7326/0003-4819-46-6-1214
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As there has been no dearth of editorial comment on the Salk antipoliomyelitis vaccine it might seem superfluous to add more, particularly as the most acute issues which arose in 1955 about this vaccine seem to have been more or less settled. The uproar which took place in the spring of 1955 has subsided and the experience of 1956 has satisfied most physicians in this country that the vaccine is safe and probably at least as effective as the Francis report originally demonstrated.1 This report of the 1954 field trial indicated that what might still be called an "acute immunity"


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