Treponema pallidum immunohistochemistry

A pathologist applies a specially prepared antibody stain to tissue placed on a microscope slide. If organisms are present and recognised by the stain, they may appear as a coloured signal. The test is interpreted with the tissue appearance, symptoms, sexual health history, and blood tests; a positive stain is not a measure of how active an infection is.

A negative result does not always settle the question. The organism may be sparse, the sample may come from an unaffected area, or treatment may have changed the findings. Other infections and non-infectious conditions can produce similar tissue changes, so the report should be read as part of the full assessment.

Ask which tissue was tested and whether blood tests or a swab are also needed. Share any past syphilis diagnosis, treatment, pregnancy, immune condition, or medicines with the clinician. If infection is diagnosed, follow the prescribed treatment and ask how partners should be notified and tested. Avoid sexual contact until the care team explains when it is safe to resume it.

Do not self-treat from a pathology result. Keep a copy of the report and attend follow-up testing if recommended.

Arrange prompt medical review for a new genital, mouth, or skin ulcer, a widespread rash, eye pain or vision change, severe headache, weakness, confusion, or hearing changes. Pregnancy with a possible syphilis exposure needs timely clinical attention because assessment and treatment planning can differ.

What tissue was stained, and what did the surrounding tissue show? How does this result fit my blood tests and symptoms? Do I need treatment, repeat testing, or assessment for other infections? Should current or recent partners be tested? When should I return, and which symptoms need urgent review?