Gonorrhea reinfection means catching gonorrhea again after you were already cured. It's a new infection, not the same one coming back. The leading cause is sex with an untreated partner, because successful treatment gives you no lasting immunity. The CDC recommends a retest about three months after treatment to catch it CDC STI Guidelines.
| Item | Cases per 100,000 |
|---|---|
| 2021 | 214 |
| 2022 | 194.4 |
| 2023 | 179.5 |
Why gonorrhea reinfection happens
Gonorrhea is caused by the bacterium Neisseria gonorrhoeae, which can colonize the genitals, rectum, and throat CDC About Gonorrhea. Clearing it once does nothing to protect you the next time you're exposed. Your immune system doesn't build durable, protective antibodies against this organism the way it does against some viruses, so a person can be cured, get reinfected, and cured again, over and over. There's no "one and done."
That's the biology. In practice it's simpler: someone in your sexual network still carries the infection. Usually a recent partner was never treated, was treated incorrectly, or you resumed sex before the antibiotics had finished working on both of you. Because throat and rectal infections usually cause no symptoms, an exposed partner often has no idea they're carrying it, so "I'd know if they had it" is a poor safeguard.
Reinfection is not the same as treatment failure
Distinguishing the two matters because they call for different action. True treatment failure, where the antibiotic doesn't kill the bacteria, is rare in the US for genital and rectal infections. The first-line regimen is a single ceftriaxone injection given in the clinic, and no verified US clinical ceftriaxone failures have been reported to date MMWR 2020. When gonorrhea shows up again weeks or months after a documented cure, reinfection is by far the more likely explanation.
A couple of exceptions are worth knowing. Throat gonorrhea is harder to eradicate than genital infection; even fully susceptible pharyngeal infections failed ceftriaxone a small share of the time, which is why a test-of-cure is advised for the throat (more on that below) CID 2020. And globally, ceftriaxone-resistant strains exist; the FC428 strain emerged in Japan in 2015 and has spread internationally WHO. For most US patients, a positive retest after a real cure points to a new exposure rather than a drug that failed.
Partners are the number-one reinfection driver
You can do everything right and still get reinfected from a partner who did nothing. The fix is treating the people you've had sex with. Current guidance is to notify and treat partners from the prior sixty days, and for both of you to abstain from sex for a full week after treatment so you don't pass it back and forth. Where in-person evaluation isn't possible and it's legally permitted, expedited partner therapy (EPT) — sending oral cefixime home for a heterosexual partner — is an option. Skipping the partner step is the most common reason gonorrhea "comes back."
If you need the full regimen details for yourself, see our guide to gonorrhea treatment. The short version is that oral take-home antibiotics are no longer reliable, so the cure is an injection done in the clinic.
The three-month retest
The CDC recommends retesting about three months after treatment, for gonorrhea as for chlamydia, specifically to catch reinfection rather than to confirm the original cure. This is separate from a test-of-cure. The three-month retest exists because so many people are reinfected by an untreated partner within that window, and a quiet new infection can cause damage. When you're due, you can get tested again at any exposed site.
How to tell reinfection from a missed cure
Timing and your sexual history do most of the work. A clinician reasons through it roughly like this:
- A positive test soon after treatment (within days to a couple of weeks) on a throat sample points toward a persistent or harder-to-clear pharyngeal infection rather than a fresh exposure.
- A positive test weeks to months later, after you've had a new or untreated partner, points to reinfection.
- Resumed sex inside the seven-day abstinence window, especially with the same untreated partner, is reinfection or ping-ponging rather than failure.
- A genital or rectal infection that never cleared despite confirmed ceftriaxone is uncommon in the US and would prompt resistance testing.
The lab itself can't always tell you which it was. A standard gonorrhea test using a NAAT detects bacterial genetic material and is highly accurate (sensitivity usually over ninety percent, specificity around ninety-nine percent), but a positive result doesn't say whether it's old or new. So your exposure history matters as much as the swab.
Preventing reinfection next time
The measures that actually move the needle are unglamorous and consistent:
- Treat every partner and both abstain from sex for seven days after the shot. This stops the back-and-forth that reinfects people.
- Use condoms correctly every time; mutual monogamy with a tested partner and abstinence are the only fully certain methods.
- Screen all anatomic sites of sexual exposure — first-catch urine or a vaginal swab for the genitals, plus throat and rectal swabs if those are exposed, since those infections are usually silent. Patient-collected swabs are acceptable.
- Test on the schedule your risk warrants, not just when symptoms appear.
One option you may have heard of is DoxyPEP — taking doxycycline within seventy-two hours of sex. It cuts chlamydia and syphilis by more than seventy percent, but it's much less effective against gonorrhea and the results have been inconsistent across trials CDC DoxyPEP 2024. The CDC does not recommend DoxyPEP specifically to prevent gonorrhea, partly out of concern about driving tetracycline resistance in the organism. Don't rely on it as your gonorrhea strategy.
When to retest after gonorrhea treatment
There are two different retests, and people often confuse them:
| Test | When | Purpose |
|---|---|---|
| Test-of-cure (throat only) | 7–14 days after treatment | Confirm a pharyngeal infection cleared, since the throat is harder to eradicate (culture preferred, or NAAT) |
| Reinfection retest (all sites) | About 3 months after treatment | Catch a new infection from an untreated or new partner |
For uncomplicated genital and rectal infections, a routine test-of-cure isn't needed, because the injection works. The throat is the exception: pharyngeal infections are more difficult to clear, and the pharynx acts as a resistance breeding ground where gonorrhea can persist quietly for weeks and pick up resistance genes from ordinary throat bacteria treatment-failure review. If you were treated for throat gonorrhea, go back for that test-of-cure. If you're not sure how soon a test will turn positive after a new exposure, see when to test after exposure.
When to see a clinician
Get evaluated promptly if symptoms return after treatment, if a partner tests positive, if your throat test-of-cure is still positive, or if you simply have a new exposure and are due for screening. Left alone, the consequences of untreated gonorrhea are real.
In women, untreated infection can ascend to cause pelvic inflammatory disease (PID, infection of the uterus and tubes), fallopian-tube scarring, ectopic pregnancy (a pregnancy implanted outside the uterus, which can be dangerous), infertility, and chronic pelvic pain. In men it can cause epididymitis, inflammation of the coiled tube behind the testicle that can affect fertility. In either sex, the bacteria can spread to the blood and joints — disseminated gonococcal infection (DGI), which can be life-threatening and is managed differently, usually with hospitalization. A newborn can also acquire infection at delivery. None of these require panic, but all are reasons to treat reinfection like the original infection: seriously and quickly. You can compare testing providers if you want a fast, private way to retest.