Causative organism Chlamydia trachomatis
Incubation period 2-60 days
How far to trace back 6 months
Usual testing method Nucleic acid amplification
Common symptoms

Often asymptomatic in both men (40-76%) and women (75-85%)

Mucopurulent vaginal/urethrai discharge Dysuria

PID- Pelvic pain, abnormal bleeding patterns (IMB/PCB), dyspaurenia, fever, nausea, vomiting (see PID) epididymo-orchitis-scrotal pain, swelling, erythema (See Epididymitis)

Ano-Rectal - Anal discharge/pain, eye- conjunctivitis, throat- pharyngiitis

Likelihood of transmission per act of unprotected intercourse 30-50%
Likelihood of long-term sexual partner being infected About two-thirds of male partners of infected women and female partners of infected men will be infected
Protective effect of condoms High
Transmission by oral sex Low
Duration of potential infectivity Women can be infected for years. Men can be infected for months. Limited data on duration of infectiousness overtime
Important sequelae


Epididymo-orchitis Infertility/Sterility Ectopic pregnancy

Neonatal pneumonitis and conjunctivitis. Preterm labour and low birth weight. Enhanced HIV transmission

Direct benefit of detection and treatment of contacts Cure/prevent transmission
Usual management of contacts

Counselling, clinical examination and testing for chlamydia (Presumptively treat partners)

If partners have (epididymo-orchitis) or PID (see sections)

Contact tracing priority High
Notification Genital C. trachomatis infection is notifiable in all Australian states and territories by doctors or laboratories. Genital C. trachomatis infection is not notifiable in New Zealand currently but voluntary laboratory notification occurs from most regions