Chlamydia trachomatis, an obligate intracellular human pathogen, widely parasitize human beings. Only in a small group people can Chlamydia trachomatis be morbific. Chlamydia is usually passed from one person to another during sex. How is chlamydia acquired?

The infection is most commonly spread through:
- unprotected vaginal, anal or oral sex
- sharing sex toys if you don’t wash them or cover them with a new condom each time they’re used.

Infected semen or vaginal fluid coming into contact with the eye can cause conjunctivitis.

Chlamydia can also be passed from a pregnant woman to her baby.

It is not yet clear if chlamydia can be spread by transferring infected semen or vaginal fluid to another person's genitals on the fingers or through rubbing vulvas (female genitals) together.

You cannot catch chlamydia from kissing, hugging, sharing baths or towels, swimming pools, toilet seats or from sharing cups, plates or cutlery.