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<img src='https://npr.brightspotcdn.com/dims3/default/strip/false/crop/936×702+359+0/resize/936×702!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F54%2F20%2F409eb1da48c78909466d8e096e0b%2Fpg-infection93-louse.jpg' alt='A fluorescent image of a human body louse with Yersinia pestis infection — that’s the cause of the plague — depicted in orange/red in the glands.
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The mystery: How did bubonic plague spread so rapidly? Could rat fleas have done it all? A new study points the finger at lice as possible accomplices.
(Image credit: National Institute of Allergy and Infectious Diseases)
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