Sexually transmitted infections, or STIs, include both sexually transmitted diseases, known as STDs, and the many infections that don’t progress to disease. STIs are caused by more than 30 different ...

I’ve received questions about STIs this week, so I decided to rerun a column from 2016. Some problems never go away. Q. My ex ...

Chlamydia is often called a “silent infection” because many people don’t know they have it. It’s caused by a type of bacteria called Chlamydia trachomatis and can affect both men and women. While it’s ...

Discover how SF became the first city to use doxycycline to drop STI rates by up to 24%. UCSF experts explain the impact of ...