When Rebecca Craighill Lancefield was a child around the turn of the century, scarlet fever seemed a dangerous disease that was easy enough to diagnose but difficult to treat. The victim got a raging sore throat, a high fever, and a rash that spread over most of his body and gave the illness its name. But physicians and bacteriologists found that though they could suppress the rash, they could do little else for their patients. Researchers also found that patients who had one bout of scarlet fever might never have another, but if they got the same kind of...
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