Hi dear and thanks for your query. The transmission rate of chlamydia is around 25% for one exposure or one time having unprotected sex with an infected individual. The more times you have unprotected sex with a person who has chlamydia the more likely you are to acquire the infection. Any sexually active person can be infected with chlamydia. Anyone with genital symptoms such as discharge, burning during urination, unusual sores, or rash should refrain from having sex until they are able to see a health care provider about their symptoms. Because chlamydia is usually asymptomatic, screening is necessary to identify most infections. Screening programs have been demonstrated to reduce rates of adverse sequelae in women. CDC recommends yearly chlamydia screening of all sexually active women younger than 25, as well as older women with risk factors such as new or multiple partners, or a sex partner who has a sexually transmitted infection. Hence while you have had unprotected intercourse with a chlamydia carrier better test yourself . All the best