Syphilis
MONDO:0005976A contagious bacterial infection caused by the spirochete Treponema pallidum. It is a sexually transmitted disorder, although it can also be transmitted from the mother to the fetus in utero. Typically, it is initially manifested with a single sore which heals without treatment. If the infection is left untreated, the initial stage is followed by skin rash and mucous membrane lesions. A late stage follows, which is characterized by damage of the internal organs, including the nervous system.
Also known as: Treponema pallidum caused disease or disorder, Treponema pallidum disease or disorder, Treponema pallidum infectious disease
102 clinical trials for this condition and its sub-types.
Follow this condition — get notified about new trialsSub-types
Broader categories
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Hospital at home: new study tests home care for infections
Disease control OngoingThis study looks at whether a special team of doctors and nurses can treat adults with suspected infections at home, instead of sending them to the hospital. About 500 people will be randomly assigned to either standard hospital care or home-based care from a mobile response team…
Phase: NA • Sponsor: Copenhagen University Hospital at Herlev • Aim: Disease control
Last updated Jun 27, 2026 11:00 UTC
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Can a common antibiotic beat syphilis?
Disease control OngoingThis study tests whether the antibiotic linezolid can effectively treat early syphilis in 24 adults. Participants have primary, secondary, or early latent syphilis, and some also have well-controlled HIV. The main goal is to see if linezolid reduces syphilis infection markers in …
Phase: PHASE2 • Sponsor: University of Southern California • Aim: Disease control
Last updated Jun 27, 2026 11:00 UTC
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Personalized antibiotic dosing may boost infection treatment
Disease control OngoingThis study tests whether using personalized dosing (based on drug levels in the blood) for the antibiotic teicoplanin works better than standard dosing for treating bacterial infections. About 74 adults in hospital intensive care or other units will take part. The goal is to see …
Phase: PHASE4 • Sponsor: Radboud University Medical Center • Aim: Disease control
Last updated Jun 27, 2026 09:06 UTC
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New tetracycline drugs take on superbugs in Real-World trial
Disease control ENROLLING_BY_INVITATIONThis real-world study is testing two neotetracycline drugs, eravacycline and tigecycline, in 300 adults with drug-resistant Gram-negative bacterial infections. Researchers will track how well the drugs clear the infection and monitor for side effects. The goal is to see if these …
Sponsor: The First Affiliated Hospital with Nanjing Medical University • Aim: Disease control
Last updated Jun 27, 2026 08:09 UTC
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Rapid syphilis test could speed up diagnosis
Diagnosis OngoingThis study is testing a new rapid blood test for syphilis that gives results from a fingerstick sample during a single clinic visit. About 600 adults attending a community health centre in Winnipeg will take part. Researchers want to see if this quick test is as accurate as stand…
Sponsor: University of Manitoba • Aim: Diagnosis
Last updated Jun 27, 2026 12:29 UTC
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Can a common antibiotic prevent STIs? new study tests two dosing strategies
Prevention OngoingThis study tests whether taking doxycycline before potential exposure to STIs works better than taking it after exposure. 300 men who have sex with men will be randomly assigned to one of two groups and followed for 2 years. The goal is to see which approach better prevents chlam…
Phase: PHASE4 • Sponsor: Chinese University of Hong Kong • Aim: Prevention
Last updated Jun 27, 2026 13:02 UTC
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AI predicts hospital stays, but study never started
Knowledge-focused TerminatedThis study aimed to see if a computer could learn to predict how long a patient would stay in a home hospital program. Researchers planned to use data from past patients to train the computer. However, the study was withdrawn before any patients were enrolled, so no results are a…
Sponsor: Brigham and Women's Hospital • Aim: Knowledge-focused
Last updated Jun 27, 2026 11:03 UTC
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Immune cell showdown: autoimmune vs. infection vs. healthy
Knowledge-focused ENROLLING_BY_INVITATIONThis study looks at immune cells from people with autoimmune diseases (like lupus), people with infections, and healthy volunteers. Researchers want to understand how these cells differ and what makes them attack the body in autoimmune conditions. The study involves blood and bon…
Sponsor: Emory University • Aim: Knowledge-focused
Last updated Jun 27, 2026 07:53 UTC
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Lockdowns delayed syphilis diagnoses, study finds
Knowledge-focused OngoingThis study examines how the COVID-19 pandemic affected syphilis cases and their interaction with HIV. Researchers will review medical records of 240 adults diagnosed with syphilis in Italy between 2017 and 2025. The goal is to see if pandemic restrictions led to delayed diagnoses…
Sponsor: Azienda Ospedaliera SS. Antonio e Biagio e Cesare Arrigo di Alessandria • Aim: Knowledge-focused
Last updated Jun 26, 2026 12:41 UTC