Dear Doctors,
just a short question: After a relatively brief (1 min) insertive unprotected oral experience with unknown, promiscuous woman in the US, I started a 7 day course of doxyline (2 x 100mg daily) just about 1,5 hour after the experience (200 mg loading dose as first dose). Would this prophylactic intervention also prevent incubating syphilis? If not, how long would I need to get a reliable test answer on a modern IgG/IgM syphilis test after termination of doxy treatment?