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 ...

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 ...

The number of babies being born with syphilis in the U.S. kept increasing last year, even as the number of cases of sexually transmitted infections (STIs) in the country dropped, according to new ...