STUDY: Regular doses of Truvada extremely effective in preventing HIV infection. But there’s a downside:

All but four of the 657 participants in the Kaiser study were gay men, and 84 percent of them reported multiple sexual partners.

After starting PrEP, half of them became infected with syphilis, gonorrhea or chlamydia within a year. . . .

Although it is possible that PrEP contributed to higher rates of syphilis, gonorrhea and chlamydia, rates of those infections had begun climbing among gay men even before PrEP became available, Dr. Volk said.

One step at a time.