Chlamydia does not spread from ordinary kissing, explains the Centers for Disease Control and Prevention. Chlamydia spreads by vaginal, oral or anal sex with a partner already infected with chlamydia.
People who have had chlamydia before and have received effective treatment are still vulnerable to the sexually transmitted disease by participating in unprotected sex, according to the Centers for Disease Control and Prevention. The only guaranteed way to avoid an STD is sexual abstinence. To reduce the risk of chlamydia, individuals should always use condoms and limit sexual partners, advises WebMD. If any signs of infection arise, recommended steps include immediately stopping sexual activity and consulting a doctor.