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Syphilis clinical trials recruiting in the U.S.

11 studies for Syphilis are recruiting participants at sites across the United States.

Syphilis is a sexually transmitted disease. It causes sores on the genitals, rectum, or mouth. Read about testing, prevention, and treatment.

Cities with the most studies

• Los Angeles, CA5 studies
• Houston, TX5 studies

By state

• California5 studies
• Texas5 studies

Recently updated studies

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.