If the present trend holds, the U.S. will have fewer cases of paralytic polio in 1961 than in any year since the Salk vaccine became available. Up to July 7, only 157 cases were reported to the Communicable Disease Center of the U.S.
Public Health Service, as against 385 in 1960. More significantly, since the "disease year'' began April 1, there have been less than half as many cases as in the same period last year.
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