Medicine: Polio Progress

Like birds in the spring, polio moves northward over the nation from the South. This year, the fifth since Salk vaccine was introduced, it began in Florida and southern Texas, hit hardest at Mexicans. Last week it struck the Middle West, with concentrated epidemics among slum-dwelling Negroes in Des Moines and Kansas City. At week's end the U.S. Public Health Service reported that thus far in 1959 there have been 855 polio cases (574 paralytic) as against 588 (297 paralytic) in the same period last year.

More and more apparent to polio researchers is...

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