Chlamydia (kla-mid-ee-a) is the most common STI with 1-in-12 young people infected!
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 the leading cause of infertility.
The good news? - It's free and easy to get a Chlamydia test...