Are You Guaranteed to Get Chlamydia if Your Partner Has It?
Discovering that a sexual partner or potential sexual partner has chlamydia will always raise questions about your own health and what might happen. Chlamydia is transferred through sexual contact, so many people are rightfully cautious.
Chlamydia can be passed through sexual contact, so are you guaranteed to get chlamydia if your partner has it?
No. You are not guaranteed to get chlamydia if your partner has it. Chlamydia doesn’t have a 100% transmission rate. This means that one partner can test positive while the other tests negative. However, exposure can still carry a risk, so both partners should be tested and follow medical advice after exposure.
Read on to learn how easily chlamydia is passed on, why one partner can test positive while the other tests negative, and what to do if your partner has been diagnosed.
Does Chlamydia Have a 100% Transfer Rate?
No. Chlamydia does not have a 100% transmission or transfer rate.
In fact, the current British Association for Sexual Health and HIV (BASHH) 2026 chlamydia guideline notes that between one-third and two-thirds of contacts of people with chlamydia will test negative. The BASHH guidance also explains that the likelihood of a partner testing positive will vary depending on factors like the type of partnership, symptoms, bacterial load, age, and whether or not they used a condom.
This doesn’t mean that everyone has a one-in-three chance of catching chlamydia when exposed. Those figures relate to groups of sexual contacts rather than the risk from one particular sexual encounter.
It’s impossible to calculate the odds of you personally contracting chlamydia from an infected partner.
How Likely Is It to Get Chlamydia From Someone Who Has It?
While it’s not a 100% transmission rate, there is still a significant risk of catching chlamydia through sexual contact with somebody who has the infection, particularly where condoms aren’t used.
NHS guidance states that chlamydia can be passed through vaginal, anal, or oral sex without a condom. It can also be transmitted when infected vaginal fluid or semen is transferred through sex toys or hands.
Here, we’ll go into the factors that can impact the likelihood of contracting the virus from an infected partner. You can also read our full guide to having sex during chlamydia treatment for more information.
What Type of Sexual Contact Took Place?
It’s possible for Chlamydia to infect different parts of the body, including the genitals, rectum, and throat.
Vaginal and anal sex can transmit chlamydia, while chlamydia can also be passed through oral sex. The site of exposure will also affect which samples you’ll need to provide when you get tested.
Kissing, on the other hand, is not considered a recognised route for chlamydia transmission. You can read more in our guide to whether you can get chlamydia from kissing.
Were Condoms Used?
Using condoms correctly can reduce your chance of getting chlamydia, but it’s not guaranteed due to potential mistakes or misuse. CDC (U.S. Centers for Disease Control & Prevention) guidance recommends ensuring that you’re using condoms correctly every time you have sex as one way of lowering the risk of infection.
However, using condoms doesn’t mean you can just ignore a known exposure. If you know your partner has tested positive, you should still arrange chlamydia testing even if you used protection.
Find out more about whether you can catch chlamydia with a condom.
How Often Were You Exposed?
One sexual encounter isn’t certain to transmit chlamydia. At the same time, repeated sexual contact with an untreated infected partner provides more opportunities for transmission to take place, and therefore increases the risk that you contracted the infection.
This is why it’s safer to think in terms of risk, rather than trying to calculate a percentage chance for each individual encounter.
Can One Person Have Chlamydia and Their Partner Not?
Yes. One person can have chlamydia and their partner not, even when the couple has been having sex.
A negative result in one partner doesn’t prove that the other person’s positive result is wrong, or vice versa. Chlamydia isn’t transmitted during every sexual encounter in the way that many people think.
There are several reasons partners may receive different results:
- Transmission might not have occurred despite sexual contact
- Condoms or other barriers may have reduced the risk
- Different anatomical sites may have been exposed
- One partner may have tested too soon after their most recent exposure
- One person may have acquired the infection before the current relationship
Testing at the right time is particularly important. BASHH’s 2026 guidance says that an asymptomatic contact who presents within 14 days of exposure may need repeat testing two weeks after exposure.
At Your Sexual Health, we recommend taking our chlamydia tests 14 days after exposure, which is when they’re most accurate. It’s not possible to get an earlier test for chlamydia.
If your partner has tested positive, do not rely on their result to determine your own status. You need your own test.
Can a Faithful Couple Get Chlamydia?
A chlamydia diagnosis does not automatically prove that somebody has cheated.
Chlamydia frequently causes no symptoms. The NHS states that most people with chlamydia do not experience symptoms, meaning somebody can carry the infection without knowing that they have it.
Another factor is that an untreated infection will continue rather than resolving itself. As a result, your partner might have been infected by a previous sexual partner before entering your current relationship and only discover it after being tested later.
A chlamydia test can tell you whether the infection has been detected, but it generally cannot tell you exactly when it was acquired or who it originally came from.
For a more detailed explanation, read our guide: How Did I Get Chlamydia If I Didn’t Cheat?
What Should You Do if Your Partner Has Chlamydia?
If you’ve had a current or past sexual partner tell you they have chlamydia, you need to arrange testing rather than just assuming you did or didn’t contract the infection.
The NHS advises that all sexual partners of an infected person should be tested.
You should:
- Arrange a chlamydia test: If the exposure was very recent, you’ll need to wait at least 14 days before tests become accurate.
- Seek medical advice if you have symptoms: This is particularly important if you have lower abdominal pain, testicular pain or swelling, or if you are pregnant.
- Avoid further sexual contact if you or your partner are undergoing treatment, following the instructions given by your healthcare professional.
- Consider screening for other STIs: BASHH recommends offering contacts of people with chlamydia screening for other STIs as appropriate.
- Do not use symptoms as a substitute for testing: Most people with chlamydia have no symptoms.
Need a Private Chlamydia Test?
If you or your partner has tested positive for chlamydia, Your Sexual Health offers a wide range of private chlamydia tests through in-clinic and home-testing options – from instant chlamydia tests to comprehensive profiles that cover multiple STDs.
We’ve got more than 100 clinics nationwide, all facilitated by our laboratory testing process through a UKAS-accredited laboratory. Results are provided through a secure online portal. If you test positive, we’re also the only private STD testing provider in the UK that can arrange a free private GP consultation to discuss your result and treatment.
Take a look at our chlamydia testing options to find the best option for you, or get in touch for more information.
Chlamydia Transmission FAQs
Does a Negative Chlamydia Test Mean I Definitely Didn’t Catch It?
Provided that testing has been completed in the correct timeframe and from a legitimate testing provider, you can be confident in your result. However, testing too soon can result in a false negative and might require another test. Ensure you wait at least 14 days before completing a chlamydia test.
If you’re unsure when to test, get in touch to speak with our team.
Can You Get Chlamydia From Oral Sex?
It is possible to pass chlamydia through oral sex and infect the throat or genital area, depending on the type of contact involved.
Read our full guide to getting chlamydia from oral sex.
Can You Get Chlamydia From Kissing?
Normal kissing is not a recognised transmission risk for genital chlamydia. The infection is transmitted through sexual contact that involves infected genital fluids and tissues.
Learn more in Can You Get Chlamydia From Kissing?.
Can Condoms Stop Chlamydia From Spreading?
When used correctly, condoms can significantly reduce the chance of transmitting chlamydia. However, no protective measure should be used to ignore a known exposure. Condoms aren’t a guarantee that the infection won’t be passed along.
If your partner has chlamydia, arrange testing even if you used a condom. Read more about catching chlamydia while using a condom.
Can You Get Chlamydia Again After Treatment?
Yes. The successful treatment of one chlamydia infection doesn’t make you immune to being infected again in the future. If you’re exposed again, you have the same risks of being infected again.
Ensure that you follow treatment instructions and get both partners tested and treated to reduce the risk of reinfection.
