Sexually transmitted infections (STIs) are more common than many people realize. The World Health Organization estimates that more than 374 million new STIs occur each year worldwide, and chlamydia ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Because chlamydia often causes no symptoms, these numbers likely underestimate its true prevalence. But even these statistics ...