Clinical Research Directory

Inclusion Criteria: To be eligible for this study, participants must be: 1. Diagnosed cases of primary, secondary or early latent syphilis with RPR titer ≥1:8 within 3 weeks prior to enrollment 2. 16 years of age or older 3. Able to provide informed consent/assent. 4. Individuals with HIV infection must be on treatment for HIV-infection and virologically suppressed (viral load \< 200 copies/mL) or have a CD4 count ≥ 350 cells/mm3 as of their most recent test prior to enrollment. Exclusion Criteria include: 1. Pregnancy or a positive pregnancy test on the day of enrollment 2. Patients showing signs and symptoms of neurosyphilis. 3. Participants who receive certain psychotropic medications, e.g., MAO inhibitors, SNRIs, SSRIs 4. Serofast RPR titer, defined as persistently positive RPR titer without more than 4-fold (2-titer level) change for 12 months or greater. 5. Recent (within the past 7 days) or concomitant antimicrobial therapy with activity against syphilis, namely azithromycin, tetracycline, doxycycline, cefixime, ceftriaxone or other beta lactam antibiotics (e.g. amoxicillin) 6. Individuals with HIV infection who report HIV treatment interruption for more than 4 weeks since their most recent viral load or CD4 test. 7. Individuals with known myelosuppressive conditions or receiving myelosuppressive medication 8. Individuals weighing 150kg (330 lbs) or more. 9. Individuals with known end renal stage disease, for example individuals in hemodialysis. 10. Self-reported allergy to linezolid or penicillin. 11. Unwilling or unable to attend follow-up visits.