What is chlamydia?

Chlamydia is the most commonly diagnosed sexually transmitted infection (STI) in the UK affecting both men and women. Chlamydia is a bacteria that can be found in the semen, vaginal fluids and saliva of people who have the infection. The bacteria can be passed from having unprotected sex, including oral sex.

Chlamydia (kla-mid-ee-a) is the most common STI

You won’t know if you (or one of your partners) have chlamydia, because it often has no
symptoms yet can lead to serious health problems and is a leading cause of infertility.

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