Disease

Syphilis

Infection with Treponema pallidum subspecies pallidum

A sexually transmitted bacterial infection that progresses through stages if untreated and can pass to a fetus during pregnancy; it is curable with antibiotics.

WORLD HEALTH ORGANIZATION IDENTIFIERSyphilisView source record ↗

Overview

EXPLORE BY LEVEL

Syphilis is a bacterial infection spread mostly through sexual contact. It is cured with antibiotics. Blood tests look for to the bacterium.

Quick Facts

AT A GLANCE
CauseTreponema pallidum subspecies pallidum
SerologyTreponemal and nontreponemal antibody tests are used together

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Recommended Reading

Trusted references for learning more about Syphilis.

Research Claims

Serologic diagnosis requires both test classes because each alone has limits. Nontreponemal titers are used to monitor treatment response; treponemal reactivity persists in most patients regardless of treatment or activity.

Treponemal antibody tests usually remain reactive for life, even after adequate treatment, so a reactive treponemal test alone does not show current disease activity.