Medicine: Too Many Polio Vaccines?

Proponents and opponents of live-virus poliomyelitis vaccines, which are taken by mouth, got closer to the infighting last week. All the leading scientists involved on both sides of the struggle to displace the Salk killed-virus vaccine (which must be injected) appeared at research meetings in Atlantic City and Newark, N.J., and nearly all took off the gloves. Government umpires looked on uncomfortably, dreading the day when they have to decide on licensing an oral vaccine.

Shift in Aim. Despite five years of intensive efforts to get everybody in the U.S. Salk-vaccinated (about 300...

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