Medicine: Calling the Shots

Although the Salk vaccine against poliomyelitis has been generally effective —saving hundreds of lives and preventing thousands of cases of paralysis in four years—much of the material used in about 200 million U.S. inoculations has been no good. As a result, an all-out effort to improve the commercially produced vaccine is now being made. Until this succeeds, individuals who have already had three injections should get a fourth.

This was the word last week at a University of Michigan symposium with which the National Foundation launched its 1959 March of Dimes. Vaccinventor Jonas Salk was more frank than ever before in...

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