Chlamydia: Can It Appear After Months of Being Monogamous? - Urology

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I have been with my boyfriend for a year.
I am an egg donor, so I have to undergo regular STI screenings.
I had tests done after one month and four months of being together, and I was clear of any infections.
However, after eight months, in March of this year, I tested positive for Chlamydia and was informed that I could not donate eggs.
I am certain that I have only been with my boyfriend, and he insists that we are each other's only sexual partners.
How is it possible that I had no infections in the first half of the year but suddenly tested positive for an STI in the second half?

Ju Jie, 20~29 year old female. Ask Date: 2018/03/21

Dr. Xu Wencang reply Urology


Chlamydia infection in women is confirmed only if Chlamydia antigens are detected in vaginal secretions.
The presence of Chlamydia antibodies in the blood is not a reliable indicator.
It is advisable to consult a gynecologist for further evaluation and treatment.

Reply Date: 2018/03/21

More Info


Chlamydia is a sexually transmitted infection (STI) caused by the bacterium Chlamydia trachomatis. It is often asymptomatic, which means that many individuals may not show any signs or symptoms of the infection, making it possible for it to go undetected for long periods. In your case, it is understandable to be concerned about the sudden appearance of Chlamydia after several months of being in a monogamous relationship.
There are several factors to consider regarding how Chlamydia can appear after a period of being sexually active with only one partner:
1. Incubation Period: Chlamydia has an incubation period that can range from one to three weeks after exposure. This means that if either partner had been exposed to the infection before the relationship began, it might not have shown up in tests conducted earlier. If your boyfriend had been infected previously and was asymptomatic, he could have transmitted the infection to you later on.

2. Testing Accuracy: The accuracy of STI testing can vary based on the type of test used and the timing of the test. If you were tested too early after exposure, the infection might not have been detected. It is also possible that the tests conducted during your earlier screenings were not sensitive enough to detect the infection, especially if it was in its early stages.

3. Reinfection: If one partner is infected and the other is not treated, the untreated partner can reinfect the treated partner after they have been cured. This is why it is crucial for both partners to be tested and treated simultaneously if one is diagnosed with Chlamydia.

4. Asymptomatic Nature: Many individuals with Chlamydia do not experience symptoms. This asymptomatic nature can lead to a false sense of security, as both partners may believe they are free of the infection. Regular screenings are essential, especially in high-risk populations or situations where partners have had previous sexual encounters.

5. Behavioral Factors: While you mentioned that both you and your boyfriend are each other's only sexual partners, it is essential to consider any potential exposure to Chlamydia through other means, such as shared sexual partners in the past or even non-sexual transmission in rare cases.

Given your situation, it is crucial to have an open and honest conversation with your boyfriend about the test results and the importance of both partners getting treated. Additionally, follow-up testing after treatment is essential to ensure that the infection has been cleared.

In summary, Chlamydia can indeed appear after months of being in a monogamous relationship due to various factors, including the incubation period, testing accuracy, and the asymptomatic nature of the infection. It is vital to maintain regular STI screenings and communicate openly with sexual partners to ensure both parties are healthy and to prevent the spread of infections. If you have further concerns or questions, consider consulting a healthcare provider for personalized advice and testing options.

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