Scientists have uncovered the oldest known genome of the bacterium responsible for syphilis, revealing a previously unknown lineage that existed thousands of years ago in the Americas.

In 1495, a devastating infection began to sweep across Europe, causing pustules and sores to erupt on people’s bodies and faces. Accusatory finger-pointing about the scourge, syphilis, began almost ...

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Genital ulcers could be one of many sexually transmitted diseases or an infection that is not transmitted by sex. An expert walks you through a case. This is the first of a three-part series on ...