Fluorescent image of a human body louse with Yersinia pestis infection (orange/red) in the Pawlowsky glands. Y. pestis has been the culprit behind numerous pandemics, including the Black Death of the ...

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. The plague — which in the mid-14th century was also ...