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 ...

Chlamydia is a sexually transmitted bacterial infection caused by an organism called Chlamydia trachomatis. Chlamydia is thought to be one the most common of all the sexually transmitted diseases.

Chlamydia often has no noticeable symptoms. If symptoms do appear, they usually do so between 7–21 days after exposure. Tests can usually detect chlamydia 1–2 weeks after exposure. The time between a ...