Can chlamydia be undetected by an exam?

Yes, chlamydia can sometimes be undetected by an exam. This is because chlamydia is a sexually transmitted infection (STI) caused by bacteria called Chlamydia trachomatis. These bacteria can live in the body for months without causing any symptoms, so it is possible for someone to have chlamydia without knowing it. Additionally, chlamydia can sometimes be difficult to detect during an exam because the bacteria can hide in areas that are not easily visible or accessible, such as the cervix, urethra, or rectum.