What should you know about the syphilis organism?

Treponema pallidum is a delicate spiral-shaped bacterium that enters through small breaks in skin or through mucous membranes. It spreads through direct contact with an infectious lesion during sexual contact, including oral, vaginal or anal sex. It is not diagnosed from a symptom alone. Testing commonly involves blood tests, and a clinician may assess a visible lesion or recommend additional tests.

Syphilis can pass through stages. An early sore may be painless, then a rash, fever or swollen glands may appear, although symptoms can be absent. Without treatment, infection can remain quiet and later affect organs such as the nervous system, eyes or heart. Appropriate antibiotic treatment kills the bacterium, but it does not erase every previous effect of infection.

Arrange STI assessment if you have a new sore, rash, a partner with syphilis, or a possible exposure. Avoid sexual contact until you receive clear clinical advice. If testing confirms infection, take the prescribed antibiotic on schedule and attend follow-up. Recent partners should receive confidential advice, testing and treatment when indicated. STI Screening can help you plan testing, and Antibiotic Treatment explains the treatment pathway.

Seek prompt care after a possible exposure or if a sore or unexplained rash appears. Seek urgent help for vision changes, eye pain, hearing changes, severe headache, confusion, weakness or difficulty walking. Pregnancy or possible pregnancy should be mentioned at the appointment because infection can pass to a fetus and needs timely management.

Ask which tests are needed, whether the timing of exposure changes interpretation, whether other STIs should be checked, which antibiotic is appropriate, when follow-up is due, and how partners can be notified safely and confidentially.