Chlamydia

What Is Chlamydia?

Chlamydia is a common bacterial sexually transmitted infection (STI) that is typically curable with prescription antibiotics. It is caused by the bacterium Chlamydia trachomatis and remains one of the most frequently reported STIs in the United States.

Many people who have chlamydia experience no symptoms at all. However, even without symptoms, the infection can lead to serious complications if left untreated, including permanent damage to the reproductive system and potential infertility.

Symptoms of Chlamydia

Symptoms, when they appear, usually develop 1–3 weeks after exposure. However, a significant number of individuals remain asymptomatic.

In women, common symptoms may include:

• Abnormal vaginal discharge
• A burning sensation or pain during urination

If the infection spreads from the cervix to the upper reproductive tract (such as the fallopian tubes, ovaries, or uterus), it can cause pelvic inflammatory disease (PID). This may result in abdominal or pelvic pain, fever, nausea, bleeding between periods, or pain during intercourse. In pregnant individuals, untreated chlamydia can increase the risk of premature rupture of membranes, preterm delivery, or other complications.

In men, symptoms can include:

• A burning sensation or pain during urination
• Unusual discharge from the penis
• Pain or swelling in one or both testicles

The infection may spread to the testicles, causing inflammation and tenderness.

Symptoms that can affect both men and women include:

• Rectal pain, discharge, or bleeding (especially after receptive anal sex)
• Pain during bowel movements or urination
• Pelvic discomfort
• Itching in the genital area

Note that some symptoms listed in older materials (such as fluid-filled blisters) are more characteristic of other STIs and should prompt evaluation for multiple infections.

How Is Chlamydia Transmitted?

Chlamydia spreads primarily through vaginal, anal, or oral sex with an infected partner. It can also be transmitted by sharing sex toys that have not been properly cleaned. Transmission can occur even if the male partner does not ejaculate.

The bacteria infect mucous membranes in areas such as the cervix, urethra, rectum, throat, and sometimes the eyes. It does not survive on intact skin or surfaces like clothing or toilet seats.

Chlamydia can also pass from a pregnant person to their infant during vaginal delivery, potentially causing eye infections or pneumonia in the newborn. Screening and treatment during pregnancy can help prevent this.

Can You Get Chlamydia from Kissing or Non-Sexual Contact?

Chlamydia is not transmitted through casual mouth-to-mouth kissing, hugging, sharing towels, swimming pools, or toilet seats. However, it can be spread during oral-genital contact.

Who Is at Higher Risk for Chlamydia?

Anyone who is sexually active can contract chlamydia, particularly with unprotected sex or multiple partners. Certain groups face higher risk due to behavioral and biological factors:

• Young people aged 15–24 account for a large proportion of cases.
• Sexually active young women (ages 14–24) have elevated rates, partly due to the anatomy of the cervix and vaginal lining.
• Men who have sex with men (MSM) are at increased risk, especially through anal or oral sex.

Recommended Chlamydia Screening

The Centers for Disease Control and Prevention (CDC) provides the following general screening guidance:

• Sexually active women under 25 years old should be screened annually.
• Women 25 and older should be screened if they have risk factors, such as new or multiple sex partners or a partner with an STI.
• All pregnant individuals should be tested during their first prenatal visit. Those under 25 or at increased risk may need retesting in the third trimester.

Men who have sex with men should discuss site-specific testing (urethra, rectum, throat) with their healthcare provider, with frequency based on risk level.Retesting approximately 3 months after treatment is often recommended to check for reinfection.

How to Prevent Chlamydia

The most reliable way to avoid chlamydia and other STIs is abstinence from sexual activity. For those who are sexually active, risk can be reduced by:

• Using a latex or polyurethane condom correctly every time for vaginal, anal, or oral sex.
• Using dental dams for oral-genital or oral-anal contact.
• Maintaining a mutually monogamous relationship with a partner who has tested negative for STIs.
• Limiting the number of sexual partners.
• Avoiding douching, which can disrupt healthy vaginal bacteria.

Open communication with partners about sexual health and STI testing is an important part of prevention. If you or a partner has symptoms or a recent positive test, refrain from sexual activity until treatment is complete and symptoms have resolved.

Is Chlamydia Curable?

Yes, chlamydia is curable with appropriate antibiotics prescribed by a healthcare provider. Common regimens include doxycycline (taken twice daily for 7 days) or, in certain cases (such as pregnancy), azithromycin as a single dose. Treatment during pregnancy is available and helps protect both parent and infant.

After treatment, it is important to complete the full course of medication, notify recent sexual partners so they can be tested and treated, and abstain from sex until the infection is cleared. Follow-up testing is often advised to ensure the infection has resolved and to check for reinfection.

Important Note

This information is for educational purposes only and is not a substitute for professional medical advice. If you have concerns about chlamydia or any STI, consult a qualified healthcare provider for personalized testing, diagnosis, and treatment. Regular screening and prompt care are key to protecting your reproductive and overall health.

Resources

• CDC – About Chlamydia: https://www.cdc.gov/chlamydia/about/index.html
• CDC STI Treatment Guidelines: https://www.cdc.gov/std/treatment-guidelines/default.htm
• CDC Screening Recommendations: https://www.cdc.gov/std/treatment-guidelines/screening-recommendations.htm