Mycoplasma genitalium: The Common STI You’ve Probably Never Heard Of
If you have never heard of Mycoplasma genitalium (often called Mgen), you are certainly not alone. While most people are familiar with chlamydia and gonorrhoea, this microscopic bacterial infection is a significant contributor to reproductive health issues worldwide. First discovered in the 1980s, it has recently gained notoriety as a “superbug” due to its increasing antibiotic resistance.
As a sexually transmitted infection (STI), Mgen often flies under the radar because it frequently causes no symptoms. However, left untreated, it can lead to serious complications. Understanding how to recognise, test for, and treat this infection is vital for your long-term wellness.
What Exactly is Mycoplasma genitalium?
Mycoplasma genitalium is a type of bacteria that lacks a cell wall. This unique characteristic makes it naturally resistant to many common antibiotics, like penicillin, which work by attacking bacterial cell walls. It primarily affects the mucous membranes of the urethra, cervix, and throat.
According to the NHS, it is now considered one of the most common causes of urethritis in men and cervical inflammation in women. Because it is so small and grows slowly, it was historically very difficult for scientists to study.
Recognising the Symptoms
One of the trickiest aspects of Mgen is that many people remain asymptomatic, meaning they show no signs of infection at all. However, when symptoms do occur, they often mimic other STIs. According to the CDC, symptoms can vary significantly between genders.
Symptoms in Men
- Pain or a burning sensation during urination.
- Discharge from the penis.
- Inflammation of the urethra (urethritis).
Symptoms in Women
- Pain during or after sexual intercourse.
- Unusual vaginal discharge.
- Bleeding between periods or after sex.
- Pelvic pain, which may indicate pelvic inflammatory disease (PID).
If you notice any of these changes, it is essential to visit a sexual health clinic for a professional evaluation.
How is Mgen Different from Chlamydia?
Because the symptoms overlap, Mgen is often misdiagnosed as chlamydia. However, the treatment protocols are different. The following table highlights the key differences between these two common infections.
| Feature | Mycoplasma genitalium | Chlamydia |
|---|---|---|
| Organism Type | Small bacteria without a cell wall. | Intracellular bacteria. |
| Detection | Requires a specific PCR test. | Standard STI screening. |
| Resistance | High risk of resistance to common drugs. | Generally responds well to standard antibiotics. |
| Common Complication | Persistent urethritis. | Infertility and PID. |
Diagnosis: Getting the Right Test
Standard STI tests often do not include Mgen. If you have persistent symptoms but have tested negative for chlamydia and gonorrhoea, you should specifically request a test for Mycoplasma genitalium. The Mayo Clinic notes that specialized diagnostic tools are necessary.
The most effective method is a Nucleic Acid Amplification Test (NAAT), often referred to as a PCR test. For men, this usually involves providing a first-void urine sample (the first bit of urine in the morning). For women, a vaginal swab is the preferred method, as it provides a more accurate result than a urine sample alone.
Guidance from BASHH suggests that testing should be targeted towards those with symptoms or those whose sexual partners have tested positive.
Treatment and the “Superbug” Concern
Treating Mgen has become increasingly complex. In the past, a single dose of azithromycin was often enough to clear the infection. However, global data published in Nature shows that many strains are now resistant to this first-line treatment.
If azithromycin fails, doctors often prescribe moxifloxacin, a stronger antibiotic. However, even resistance to moxifloxacin is on the rise. Because of this, it is vital to follow your doctor’s instructions exactly and complete the full course of medication, even if you start to feel better early on. For more clinical insights on treatment protocols, the BMJ provides updated evidence-based guidelines.
The Importance of Partner Notification
If you test positive, your recent sexual partners must be informed and tested. This prevents the “ping-pong” effect, where partners continually reinfect each other. Organisations like the Terrence Higgins Trust offer excellent resources on how to start these difficult conversations.
Potential Complications
Ignoring an Mgen infection can have long-term consequences for your reproductive health. In women, the bacteria can ascend to the upper reproductive tract, causing pelvic inflammatory disease (PID). This can lead to scarring of the fallopian tubes, chronic pelvic pain, and an increased risk of ectopic pregnancy or infertility. Research in the Lancet has highlighted these risks extensively.
In men, chronic infection is a leading cause of persistent urethritis and has been linked to inflammation of the prostate, though more research is needed to confirm the full extent of its impact on male fertility.
Prevention: Staying Safe
The best way to prevent Mycoplasma genitalium is through safe sex practices. While no method is 100% effective except abstinence, you can significantly reduce your risk by:
- Using internal or external condoms consistently for all types of sexual activity.
- Limiting your number of sexual partners.
- Undergoing regular STI screenings, especially when changing partners.
- Communicating openly with partners about sexual health history.
Public health resources from Public Health England emphasise that barrier methods remain our best defence against the spread of bacterial STIs.
The Bottom Line
While Mycoplasma genitalium may not be a household name yet, it is a significant player in the world of sexual health. With the rise of antibiotic resistance, it is more important than ever to be proactive. If you have symptoms that won’t go away, don’t settle for a standard test—ask specifically for Mgen testing. For more information on STI trends globally, visit the WHO website.
Staying informed and taking reproductive health seriously is the best way to protect yourself and your partners. If you’re looking for more general health advice, Healthline and WebMD offer extensive libraries on managing sexual wellness. For detailed scientific data on the bacteria itself, you can explore ScienceDirect or Patient.info for a user-friendly summary of the condition.
Frequently Asked Questions (FAQs)
Can I get Mycoplasma genitalium from a toilet seat?
No. Mycoplasma genitalium is transmitted through direct skin-to-skin contact during sexual activity (vaginal, anal, or oral sex). The bacteria cannot survive for long outside the human body, so it is not spread through toilet seats, swimming pools, or sharing towels.
Is Mycoplasma genitalium a new disease?
It is not “new,” but our ability to detect it is. It was first identified in 1981, but because it grows so slowly and is difficult to culture in a lab, it took decades to develop the PCR test technology required to diagnose it accurately in a clinical setting.
Can Mycoplasma genitalium be cured?
Yes, it can be cured with the right antibiotics. However, because antibiotic resistance is common, the first treatment may not always work. It is crucial to have a follow-up “test of cure” about five weeks after finishing your medication to ensure the infection is completely gone.
