A daily dose of a widely used antibiotic can prevent some infections with syphilis, gonorrhea and chlamydia, potentially a new solution to the escalating crisis of sexually transmitted infections, scientists reported on Thursday. Scientists still have to resolve significant questions, including whether S.T.I.s might become resistant to the antibiotic and what effect it could have on healthy gut bacteria in people taking it every day. The approach would be recommended primarily to people at elevated risk of sexually transmitted infections during certain periods, said Dr. Jeffrey Klausner, an infectious diseases physician at the University of Southern California who was not involved in the new work. “The number of people who are really going to be offered this and take this is still very small,” he said. “In general, the more choices we have for people, the more prevention options we have, the better.”

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Persons: Jeffrey Klausner, “, ” Organizations: University of Southern Locations: University of Southern California