For decades, syphilis testing meant first screening a patient with a nontreponemal test, such as the rapid plasma reagin (RPR) test, which identifies recent or untreated syphilis but can yield ...
Treponema pallidum, a spirochete, causes syphilis and is spread through contact with infectious lesions or body fluids. An ulcerative skin lesion, known as chancre, typically develops at the site of ...