An all out drive by backers of oral, live-virus vaccines for the right to succeed the Salk killed-virus injections as the first line of defense against poliomyelitis reached the U.S. last week. Biggest offensive was launched in Miami and surrounding Dade County, where the entire under-40 population, estimated at 520,000, was marshaled in an effort to show that a single swallow of the three-way vaccine is not only safe but superior to Salk. By week's end the campaign's sponsors tallied more than 75,000 who had taken the vaccine. They hoped to run the total close to the half-million mark before...
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