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Chlamydia trachomatis

Chlamydia is 1 of the most common sexually transmitted infections (STIs) in the UK.

It's passed on through unprotected sex (sex without a condom) and is particularly common in sexually active teenagers and young adults.

If you live in England, are under 25 and are sexually active, it's recommended that you get tested for chlamydia every year or when you change sexual partner.