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An Analysis of 1962 Poliomyelitis Cases

Reimert T. Ravenholt, MD
JAMA. 1963;186(11):1024. doi:10.1001/jama.1963.03710110076019.
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To the Editor:  —In my previous communication, "Studies of Poliomyelitis in Seattle" (JAMA184:663 [May 25] 1963), I indicated that "severity of paralysis did not correlate with Salk vaccination status, suggesting that such vaccination provides all-or-none protection from paralytic poliomyelitis."Since then, the Communicable Disease Center, USPHS, has published an analysis of all poliomyelitis cases reported to CDC during 1962 from the entire US (Poliomyelitis Surveillance Rep, No. 277, June 7, 1963). The 1962 national experience provides considerable support for the concept that immunization with Salk vaccine gives all-or-none protection against paralytic poliomyelitis, as indicated by these data:The distribution of all paralytic cases and of fatal cases (the most severely paralyzed) according to immunization status was remarkably similar— with 62.2% of all persons paralyzed and 63.8% of all persons succumbing to poliomyelitis having had no inactivated vaccine; and 10.1% of the former group and 12.8% of the latter


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