A recently awarded grant will allow Connie Celum, a University of Washington professor of Global Health and Medicine, to evaluate whether doxycycline—an antibiotic commonly used to treat acne and Lyme disease—is safe and effective in reducing bacterial sexually transmitted infections. The study focuses on men who have sex with men (MSM) and transgender women (TGW) living with HIV and taking pre-exposure prophylaxis (PrEP), a daily pill used to prevent HIV.