Article: Plagued with doubt.(Doctor Detective)

About 650 years ago, the Black Death swept through Europe, killing one-quarter to one-half of the continent's population in a few years.

There was no explanation for the epidemic until 1894. A French scientist, Alexander Yersin, identified it as bubonic plague, a bacterial disease. Yersin had read accounts of the Black Death that described large lumps on the bodies of victims. Those lumps, he concluded, must have been buboes--dark, swollen lymph glands, which are a key symptom of bubonic plague. Rats spread bubonic plague when fleas that bite them jump to humans and bite them too.

Most scientists accept Yersin's diagnosis. however, two British scientists have ...

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