One of the largest mass vaccinations in U.S. history has occurred during the past three weeks: an estimated 1,200,000 Philadelphians, spurred by an epidemic (58 cases) of mild smallpox in Pennsylvania, surged through doctors' offices. Four physicians were left ill with "local smallpox infections" (positive vaccination reactions) acquired when glass vaccine tubes accidentally broke. Their vaccination scars will be in unusual spots: three thumbs, one right eye.
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