Mycoplasma genitalium, also called Mgen or M. genitalium, is a type of sexually transmitted bacteria. And as far as sexually transmitted infections (STIs) go, it’s the new kid on the block — so you may have never heard of it. 

STIs like chlamydia, gonorrhea, and HIV can have serious consequences if left untreated. Chlamydia, for example, can lead to infertility, and gonorrhea is becoming increasingly resistant to antibiotics. An HIV infection can lead to AIDS, and even human papillomavirus (HPV), which isn’t technically considered an STI, can increase your risk of cervical cancer. But when it comes to Mycoplasma genitalium, there's fairly limited data, so there's still a lot we don't know.

Although not very common sexually transmitted infection (only 0-5% of women have it), some experts are concerned that Mycoplasma genitalium could become the "new superbug" due to drug resistance. Therefore, it is important to be aware of its existence. Below is what we currently know about Mycoplasma genitalium, including symptoms, treatment options, and how it can affect your sexual health.

What is mycoplasma genitalium? 

Mycoplasma genitalium belongs to the Mollicutes class, which are different from other bacteria because they don't have a cell wall. 

M. genitalium is the tiniest bacteria of this kind and is notoriously difficult to cultivate and study in the laboratory, which is partly why there's so much we don't know about it. 

Mycoplasma genitalium was first identified in the early 1980s but mostly went unnoticed until 2015, when a study in the Journal of Epidemiology linked it to sexual activity. It’s the only Mycoplasma species recognized by the Centers for Disease Control and Prevention (CDC) as an STI.

Mycoplasma genitalium can live in your reproductive tract — including your vagina, uterus, fallopian tubes, and urethra — without causing any problems. However, if the bacteria begin to multiply and take over, they can cause an infection.

A meta-analysis found that Mycoplasma genitalium is linked to various conditions in women, such as:

How do you get mycoplasma genitalium?

Like all STIs, you can contract Mycoplasma genitalium through sexual contact, such as unprotected vaginal or anal sex. Although it's less likely, Mycoplasma genitalium can also be passed on via oral sex or sharing sex toys. 

Mycoplasma genitalium can affect anyone who is sexually active, regardless of gender or sexual orientation, so condom use — or other barrier methods of birth control, such as dental dams — is the best way to prevent it. 

Mycoplasma genitalium symptoms

A Mycoplasma genitalium infection is often asymptomatic, and many people don't know they have it. When symptoms do show up, they're really similar to those of other sexually transmitted infections such as chlamydia and gonorrhea.

Common Mycoplasma genitalium symptoms in women include: 

As mentioned above, these symptoms can be caused by other infections. Getting tested and speaking to your healthcare provider if you notice any of these symptoms is a good idea. 

How to test for mycoplasma genitalium

To diagnose Mycoplasma genitalium, your healthcare provider may recommend something called a nucleic acid amplification test (NAAT).  

This involves providing a fluid sample through a vaginal/cervical swab or, less commonly, a urine sample. The sample is then sent to a lab to see if Mycoplasma geniutalium is present. You can also do an at-home STI test, such as Evvy's Vaginal Health Test and Expanded PCR Panel, to see if you have Mycoplasma genitalium.

The CDC advises that people who aren't showing symptoms don't need to be screened for Mycoplasma genitalium. However, if you or your sexual partners have signs of Mycoplasma genitalium infection, you should get tested. 

The CDC also recommends testing for Mycoplasma genitalium if you took treatment for urethritis and cervicitis, but the infection didn’t go away.

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Mycoplasma genitalium treatment

Mycoplasma genitalium can be treated with antibiotics. In the past, the preferred treatment was a single dose of the antibiotic azithromycin. But, recent studies have shown that this type of bacteria has become resistant to azithromycin, making it ineffective. 

Now, doctors test patients for Mycoplasma genitalium bacteria to see if it has mutated into a variant resistant to azithromycin. If it hasn't developed drug resistance, the recommended antibiotic treatment is doxycycline and azithromycin. If it has (macrolide resistance), then doctors recommend doxycycline and moxifloxacin instead.

FAQs

Is Mycoplasma genitalium a STD?

Yes, Mycoplasma genitalium is a type of bacterial infection that is spread via unprotected sex. Although it’s been around for a while, it was only classified as a sexually transmitted disease (STD) by the CDC in 2015. 

Does Mycoplasma genitalium go away?

Yes, Mycoplasma genitalium is totally curable with adequate treatment. The infection can be treated with antibiotics. That said, research shows that drug resistance is becoming more and more prevalent with Mycoplasma genitalium infections, so there's a high prevalence of treatment failure.

Is Mycoplasma genitalium the same as chlamydia?

Mycoplasma genitalium and chlamydia are two different sexually transmitted infections, although they have similar symptoms and can both lead to complications like pelvic inflammatory disease. The good news is that they can both be treated, but it's important to get tested so you can receive the appropriate treatment.

What are the signs and symptoms of Mycoplasma genitalium?

Mycoplasma genitalium is often asymptomatic (meaning it doesn’t cause any symptoms). When it does cause symptoms, however, some common ones in women are unusual vaginal discharge, a burning sensation when you pee, pain during sex, and bleeding in between periods or after sex.

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