Medicine: Loitering Polio

The polio bug is supposed to vamoose at the first frost. But this year polio is breaking the rules. California, particularly, was worried as it totted up late fall cases—as many as 140 new cases in one week.

Why? Most Californians blamed the unusually warm weather, pointed to a drop in cases after the arrival of cold rains and frosty mornings. But public health officials in Washington doubted the weather explanation. California wasn't the only state with loitering polio. North Carolina reported 24 new cases in the week ending Dec. 11 (last year there were five in the comparable week; in 1946,...

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