In Tuskegee Phase II, which antibiotic later became standard treatment was withheld from participants?

• A. Tetracycline.
• B. Aminoglycoside.
• C. Vancomycin.
• D. Penicillin.

Answer: (D)

Penicillin became the standard treatment for syphilis in the late 1940s, and in the Tuskegee Phase II study it was deliberately withheld from participants. This highlights a major ethical violation: denying an effective, proven therapy to people with a treatable disease, especially a vulnerable group, to observe the disease’s course. The act exploited participants and breached their right to beneficent care, contributing to reforms in research ethics, including informed consent and the obligation to provide the best proven treatment. The other antibiotics listed were not the standard therapy for syphilis at that time, so they wouldn’t have been the expected withheld treatment.