This 1966 microscope photo made available by the Centers for Disease Control and Prevention shows a tissue sample with the presence of numerous, corkscrew-shaped, darkly-stained, Treponema pallidum ...

Dear Dr. Roach: I read that in the 1700s, animal blood was transfused into humans to cure syphilis. Is this true? — T.U. Dear T.U.: The story is a bit more complicated. Transfusion from animals into ...

If “syphilis” sounds to you like an illness people got in another century, you’re not alone. For decades, the infection was widely considered a disease of the past. But after years of decline, ...