The bacteria that causes leprosy can also help regrow human livers
Briefly

Among all the infamous ancient diseases cropping up in human history, leprosy is perhaps second only to the plague.The chronic infection ravaged the bodies of its victims, causing skin lesions and loss of limbs much like House of the Dragon's Viserys Targaryen who actor Paddy Considine revealed had a severe form of leprosy, which wasn't explicitly stated in the show.
Read at Inverse
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