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A new laboratory study suggests that human body lice are more efficient at transmitting Yersinia pestis, the bacterium that causes plague, than previously thought, supporting the possibility that they may have contributed to past pandemics.

He was suffering from epidemic typhus, a disease spread through contact with infected body lice.

Unlike the body louse, the head louse isn't known to spread disease.

Colonies of it live in the digestive systems of body lice and are excreted in their feces.

While it has long been maintained that the Black Death was spread through fleas from rats, many now believe it was spread through human fleas and body lice.