Chlamydia is a common sexually transmitted infection (STI) caused by the bacterium Chlamydia trachomatis, which affects the genital tract if acquired through vaginal sex and the mouth or anus if acquired from oral or anal sex. It is spread through unprotected sex with an infected person; it can also be spread from an infected birthing parent to their baby at birth.
Usually, chlamydia is a "silent" infection and has few symptoms. However, if left untreated, it can cause permanent damage to the woman's reproductive tract.
In cases where a young child is infected with an STI, abuse must always be suspected (see child sexual abuse). However, perinatally transmitted C trachomatis infection of the nasopharynx, urogenital tract, and rectum can persist for 2-3 years.
Related topics: acute cervicitis, bacterial vaginitis, urethritis
Chlamydial infections - Anogenital in
Synopsis
Codes
ICD10CM:
A56.2 – Chlamydial infection of genitourinary tract, unspecified
SNOMEDCT:
105629000 – Chlamydial infection
A56.2 – Chlamydial infection of genitourinary tract, unspecified
SNOMEDCT:
105629000 – Chlamydial infection
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Last Updated:05/11/2025
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Chlamydial infections - Anogenital in