This page is general health information, not medical advice. It cannot tell you whether you have an infection. A clinician can, and the testing options on this site are a good place to start.

Mycoplasma genitalium is a bacterium that can infect the urinary and genital tract. Many people have never heard of it, and it is not part of most routine testing. That gap can be confusing when symptoms linger after treatment for something else.

This guide covers what the organism is, what the research suggests, when the CDC recommends testing, and what to ask for in Las Vegas.

What mycoplasma genitalium is

Mycoplasma genitalium is a very small bacterium. It belongs to a group of organisms that have no cell wall. The CDC's 2021 STI Treatment Guidelines describe it as a sexually transmitted cause of urethritis in men and of cervicitis and pelvic inflammatory disease in women.

The missing cell wall matters for two reasons. First, it makes the organism hard to grow in a lab, so modern testing relies on molecular methods that detect its genetic material. Second, it means that some common antibiotic families do not work against it.

It is a bacterial infection. With the right treatment from a clinician, it is curable. The harder part is that it can resist some of the antibiotics clinicians usually reach for first.

Composition: what the organism is made of

You asked for the "key compounds," so here is the biology in plain terms. This section describes the organism itself, not a product.

Genome: It has one of the smallest genomes of any known self-replicating bacterium. Because it carries so few genes, it depends heavily on the cells it lives in.
Surface proteins: It has proteins that help it attach to the lining of the urinary and genital tract. Research suggests these proteins also help it avoid the immune system.
Genetic targets for testing: Tests look for specific stretches of its genetic material. The same approach is used to look for certain changes in its genes that are linked to antibiotic resistance.

Those resistance-linked changes are the reason this infection gets its own section in the CDC guidelines.

Mycoplasma genitalium symptoms

Many people with this infection have no symptoms. When symptoms do appear, they overlap with chlamydia and gonorrhea. That overlap is why symptoms alone cannot say which infection is involved. Only a test can.

The CDC describes these patterns:

In people with a penis: burning when urinating, discharge from the urethra, or irritation at the tip of the penis. This is called urethritis.
In people with a cervix: unusual vaginal discharge, bleeding between periods or after sex, or pain during sex. This is called cervicitis.
In the upper genital tract: pelvic or lower abdominal pain can be a sign of pelvic inflammatory disease. Research suggests M. genitalium is one of several organisms associated with it.

Any of these symptoms deserves a conversation with a clinician. A clinician can examine you, choose the right tests, and decide what to do next.

If you are comparing symptoms with another common infection, our guide to chlamydia symptoms, testing and treatment in Las Vegas covers the overlap.

Research findings, framed as observations

Research on M. genitalium is still growing. These are observations that the CDC guidelines and the wider literature describe, not settled conclusions.

Research suggests the organism is found in a meaningful share of people with persistent urethritis after standard treatment for other causes.
Studies suggest it is associated with cervicitis and with pelvic inflammatory disease. How often it leads to longer-term problems, such as effects on fertility, is still being studied.
Research suggests that resistance to a commonly used antibiotic family has become widespread in the United States. The 2021 CDC guidelines treat this as the central challenge in managing the infection.
Studies have also described resistance to a second antibiotic family, though it is less common. This is part of why the CDC favors testing for resistance when a lab can do it.

The honest summary is that the infection is real and treatable, but its behavior varies. That is why a clinician's guidance matters more here than for many other STIs.

When the CDC recommends testing

The CDC's 2021 STI Treatment Guidelines recommend testing for M. genitalium in specific situations:

Persistent or recurrent urethritis in people with a penis, meaning symptoms that continue or return.
Persistent or recurrent cervicitis in people with a cervix.
Pelvic inflammatory disease, where the guidelines advise considering testing.

The CDC does not recommend routine screening of people who have no symptoms. The guidelines cite limited evidence that screening people without symptoms improves health outcomes. The CDC also notes that screening could lead to treatment that is not needed and adds to antibiotic resistance.

That does not mean any individual should skip a conversation with a clinician. If you are unsure whether testing makes sense for you, ask. A clinician can weigh your symptoms, your history and your partners' situation.

Why it is not on standard panels

If you have had a routine STI panel, it probably did not include M. genitalium. The usual reasons are:

The CDC does not recommend routine screening without symptoms, so labs and clinics do not bundle it into standard panels.
The test is a different molecular test from the ones used for chlamydia and gonorrhea.
Resistance testing is not available everywhere, which affects how clinics use the test.

A negative result on a standard panel therefore says nothing about M. genitalium. That is a limit of what the panel looks for. It is not a flaw in the result.

For the broader picture of what a standard panel does cover, see our guide to STD testing in Las Vegas: where to get tested and what it costs.

Window period

For many STIs the CDC gives a window period, which is the time after exposure before a test can reliably detect an infection. The CDC guidelines do not publish a standard window period for M. genitalium. A clinician can tell you when testing makes sense in your situation.

Treatment: safety profile and resistance-guided care

Treatment is something only a clinician prescribes. This page does not name doses or schedules, and you should not use leftover antibiotics.

The CDC's 2021 guidelines describe a resistance-guided approach:

A clinician sends a sample for M. genitalium testing.
Where the lab can do it, the sample is also checked for genetic changes linked to resistance.
The clinician then chooses an antibiotic regimen based on that result.
Follow-up is planned, because the infection can persist if the first choice does not work.

If resistance testing is not available, the guidelines describe alternative approaches for clinicians. Which one is right depends on the person.

Safety considerations to raise with a clinician

These are the points worth discussing before any antibiotic course:

Allergies: Tell the clinician about any past reaction to an antibiotic.
Pregnancy or breastfeeding: Some antibiotics are chosen differently during pregnancy. A clinician will weigh this.
Other medicines: Some antibiotics interact with other prescriptions, so bring a list.
Finishing the course: Stopping early can leave the infection in place and may add to resistance.
Sex during treatment: Ask the clinician how long to wait, and about partners.

Partners often need attention too. In Nevada, expedited partner therapy is permissible according to the CDC's legal status page for the state. Whether it applies to a given infection is a question for the clinician.

Quality indicators: what to look for in a test and a clinic

You asked about sourcing and quality. For a health service, the useful signals are these.

The right test type: Ask whether the test is a molecular test that detects the organism's genetic material.
Resistance testing: Ask whether the lab can also check for resistance-linked changes, since this guides treatment.
Clinician follow-up: A good service explains the result, offers treatment through a clinician and plans a follow-up.
Clear answers about limits: A trustworthy clinic tells you what a test does and does not cover, and does not promise certainty.

Tests are a tool, and no test is perfect. Results are best read with a clinician.

Where to ask in Las Vegas

None of the Las Vegas clinic pages we reviewed say whether they run an M. genitalium test. The best step is to call and ask. You can ask whether the clinic tests for it, whether it checks for resistance, and what the visit costs.

These local options provide STI testing and treatment. Our local testing list has the full set.

Southern Nevada Health District Sexual Health Clinic

The Southern Nevada Health District runs a Sexual Health Clinic at 280 S. Decatur Blvd., Las Vegas, NV 89107, and another at 2830 E. Fremont St., Las Vegas, NV 89104. The phone for both is (702) 759-1700. The health district says walk-ins for STI testing and treatment are available until capacity is reached.

The district says charges are based on your income and the number of people in your household. It also says you will not be turned away on the day of your visit because of an inability to pay. The district also offers free Express Testing for people who do not have symptoms. Hours on the district's own pages differ, so confirm before you go. The district's sexual health clinic page has current details.

Arlene Cooper Community Health Center at The Center

The LGBTQ Community Center of Southern Nevada runs this clinic at 401 S. Maryland Parkway, Las Vegas, NV 89101. Appointments are at 702-802-5432. The Center says HIV testing is free and STI screening is low cost, and that certain insurance is billed. It says appointments are highly encouraged and that walk-ins are available for a limited number of patients daily. Treatment for STIs is provided on site. Details are on The Center's health center page.

Nevada Health Centers

Nevada Health Centers lists STD testing at the Martin Luther King Family Health Center, 1799 Mount Mariah Dr., Las Vegas, NV 89106, phone 702.383.1961, and at the Nellis Family Medical Center, 691 N. Nellis Blvd., Las Vegas, NV 89110, phone 702.563.4662. It offers a sliding-fee discount program based on family size and income. The organization's pages do not say whether walk-ins are accepted, so call first. See Nevada Health Centers reproductive health services.

Students

UNLV students can ask about STI testing at the UNLV Student Health Center, 702-895-3370. The page does not list prices, so check with the center.

Finding other sites

The CDC's GetTested locator can help you find additional testing sites by ZIP code.

Minors and privacy

Nevada sets no minimum age for this. Under NRS 129.060, a minor may give express consent to examination and treatment for any sexually transmitted disease. That statute also covers STD prevention services.

Local context

Published Nevada figures help show why testing access matters. The Nevada Office of State Epidemiology reported a 2023 chlamydia rate of 525.2 per 100,000 people in Clark County. It reported a gonorrhea rate of 241.1 per 100,000. Those figures do not cover M. genitalium, and we did not find a published local rate for it.

Under Nevada Administrative Code chapter 441A, clinicians must report cases of genital chlamydia, gonorrhea, HIV and syphilis to the local health authority. Ask a clinic how it handles results for other infections.

What to bring up at your visit

How long your symptoms have lasted, and whether they returned after treatment.
Any treatment you already received, and for what.
Whether the clinic runs an M. genitalium test, and whether it checks for resistance.
Any allergies, pregnancy or medicines you take.
How and when to follow up.

Bring photo ID and proof of income if you plan to use a sliding scale, as the Southern Nevada Health District advises.

The takeaway

Mycoplasma genitalium is a treatable bacterial infection that is often missed because it is not on standard panels. The CDC recommends testing when urethritis or cervicitis persists or returns, and favors treatment guided by resistance results. Las Vegas has free and low-cost places to start the conversation. Call ahead and ask what each can test for.

Mycoplasma Genitalium: What It Is and Where to Get Tested in Las Vegas