Chlamydia in Singapore: Symptoms, Testing & Treatment
Chlamydia is the most common bacterial STI (also called STD) in Singapore and worldwide. Up to 70% of women and 50% of men have no symptoms. It is detected by a urine or swab NAAT and cured with a short course of antibiotics prescribed by our medical team. Your personal health concierge at Hisential arranges confidential same-day testing.
Medically reviewed by Dr. Julian Ng · MD, SMC-registered · Pathogen: Chlamydia trachomatis · ICD-10 A56
What is chlamydia?
Chlamydia is a bacterial infection of the urethra, cervix, rectum, throat or eyes caused by Chlamydia trachomatis. It is the most frequently reported bacterial STI globally and a leading cause of pelvic inflammatory disease, ectopic pregnancy and infertility when left untreated.
Because most infections cause no symptoms, chlamydia is typically detected through screening rather than after a complaint. Cure is reliable with a short course of antibiotics; the challenge is finding it in the first place.
Pathogen: Chlamydia trachomatis (Gram-negative obligate intracellular bacterium).
How it spreads
- Unprotected vaginal, anal or oral sex with an infected partner
- Mother-to-baby transmission during vaginal delivery
- Sharing unwashed sex toys
- Chlamydia is not spread by toilet seats, swimming pools or casual contact
Who is at risk? Should I get tested?
- Anyone sexually active under 30 (highest prevalence band)
- New or multiple partners in the past 12 months
- A partner recently diagnosed with chlamydia, gonorrhoea or any STI
- Men who have sex with men (MSM) - rectal and pharyngeal sites at risk
- Inconsistent condom use
- Previous STI in the past 12 months (high reinfection rate)
Should I get tested? Quick self-check
Answer the questions below - your concierge can advise on the next step.
- Have you had a new sexual partner in the past 6 months?
- Have you had unprotected vaginal, anal or oral sex?
- Do you have any urethral, vaginal or rectal discharge, burning urination, or pelvic pain?
- Has a current or recent partner been diagnosed with any STI?
- Have you ever been diagnosed with chlamydia or another STI?
- Have you had receptive anal or oral sex in the past 6 months?
Symptoms
- Most infections cause no symptoms at all
- Clear, white or cloudy urethral or vaginal discharge
- Burning or pain during urination (dysuria)
- Pelvic or lower abdominal pain (women)
- Testicular pain or swelling (men)
- Bleeding between periods or after sex (women)
- Rectal pain, discharge or bleeding (rectal infection)
- Sore throat (pharyngeal infection - usually silent)
Asymptomatic in men
Approximately 50% of infected men have no symptoms
Asymptomatic in women
Approximately 70% of infected women have no symptoms
Source: see reference [1] below.
Singapore statistics
| Chlamydial genital infection is legally notifiable in Singapore under the Infectious Diseases Act 1976, First Schedule, item 38, so national figures are published each year. | [4] |
| Reported incidence in Singapore (2024) | 91.1 per 100,000 population, the highest of the three notifiable STIs that year[2] |
| Reported incidence by sex (2024) | 103.6 per 100,000 men and 77.9 per 100,000 women[2] |
| Reported incidence in Singapore (2023) | 85.6 per 100,000 population[2] |
| Global new infections (WHO estimate, 2020) | About 129 million new infections a year in adults aged 15 to 49[1] |
Testing & window period
Method
Nucleic acid amplification test (NAAT / PCR) - the gold standard
Specimen
First-void urine (men), vulvovaginal self-swab or endocervical swab (women), rectal swab, pharyngeal swab
Window period
Reliable from 1-2 weeks after exposure. Test earlier only if symptomatic; repeat at 2 weeks if first test is negative and exposure was recent.
Retest
Test of cure is typically done 4 weeks post treatment with first-line antibiotics.
Multi-site testing matters
Multi-site testing is essential. A urine NAAT only checks the urethra. If you have had receptive anal sex, a rectal swab is required - urine alone misses up to 70% of rectal infections. If you have had receptive oral sex, a pharyngeal swab is required. CDC, BASHH and Australian STI guidelines all recommend 3-site testing (urine + rectum + throat) for MSM and for anyone with relevant exposure history, regardless of gender.
Treatment
First-line: A short course of oral antibiotics, prescribed and dispensed by our medical team based on guideline-directed first-line therapy and your individual factors (pregnancy, allergies, site of infection).
Alternative: Alternative oral antibiotic regimens are available where the first-line option is unsuitable - including in pregnancy. Our team selects the appropriate regimen at consultation.
Partner management: All sexual partners from the past 60 days should be notified and offered testing and presumptive treatment. Your personal health concierge supports confidential partner notification, including anonymous letters where preferred.
Abstain from sex (including oral) for 7 days after starting treatment and until all partners are treated.
Follow-up
- Test of cure at 3-4 weeks especially for pregnant patients, rectal infection, persistent symptoms, or poor adherence
- Test for other STIs simultaneously - up to 40% of patients with chlamydia have co-infection with gonorrhoea
Prevention
- Consistent and correct condom use - reduces transmission risk substantially but not to zero
- Annual screening for all sexually active people under 30 or if having multiple partners
- Test before starting a new sexual relationship
- Avoid sharing sex toys, or use a fresh condom on the toy between partners
- Concurrent partner treatment to prevent ping-pong reinfection
Vaccination
There is no vaccine for chlamydia. Prevention relies on screening, condoms and partner treatment.
See also: STI Essentials test panel, Bacterial STI treatment
Chlamydia - frequently asked questions
Clear answers, written by our clinical team. Tap any question for its direct permalink, or reach out to your Personal Concierge for anything else.
Your personal health concierge coordinates the consult, test, prescription, partner support and follow-up screen in one confidential pathway. Appointments are often available same day or next day, subject to clinic capacity; your concierge confirms the slot.
Still have a question?
Your Personal Concierge replies within one business day - confidentially.
References
- [1] World Health Organization. Sexually transmitted infections (STIs) - key facts (2023).
- [2] Communicable Diseases Agency, Singapore. Communicable Diseases Surveillance in Singapore 2023 and 2024, Chapter 5: Blood-Borne and Sexually Transmitted Diseases.
- [3] BASHH UK. Chlamydia national guideline (2026).
- [4] Infectious Diseases Act 1976, First Schedule (infectious diseases), item 38. Singapore Statutes Online, current version.
- [5] Centers for Disease Control and Prevention. Sexually Transmitted Infections Treatment Guidelines, 2021.
Other STI conditions
Browse our other in-depth STI guides - each covers symptoms, asymptomatic statistics by sex, Singapore data, testing windows, treatment and prevention.
Your personal health concierge
One dedicated contact coordinates your testing, treatment, partner support and follow-up - discreetly and end-to-end. All care is delivered by our SMC-registered medical team.