Mycoplasma Genitalium (MG)

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Mycoplasma genitalium (MG) is a curable STI caused by bacteria that affects the cervix, urethra and rectum. Transmission can occur if you have unprotected penetrative sex with someone who already has the infection. It is often asymptomatic but can cause health problems such as pelvic inflammatory disease, endometriosis, and serious pregnancy complications. 

Signs and Symptoms

Mycoplasma genitalium (MG) is often asymptomatic. If symptoms do occur, it will usually be within 2 – 60 days of exposure. 





Mycoplasma genitalium is mainly transmitted by genital-to-genital contact and/or genital-to-anal contact. MG can be transmitted via: 

  • Unprotected vaginal or anal sex
  • Unprotected blow jobs (transmission through oral sex is uncommon)

MG can be spread even when the person with MG has no symptoms.


  • Use condoms for penetrative anal/vaginal sex
  • Use condoms for blow jobs 
  • Hold the base of the condom when withdrawing, so semen doesn’t spill out

It is recommended that you always change condoms when going from anal to vaginal or oral sex.


Here’s some information about testing for MG. You can view a list of sex worker-friendly sexual health clinics at our Where To Test page.

Testing method

When to test

Other info


Mycoplasma genitalium is curable with antibiotics. Here’s what you need to know about treating it.   

Treatment method/s

Costs and other information 

Because you may have had an asymptomatic infection you got months before, you may want also to avoid sexual contact with partners from the last 6 months until 7 days after they have also been tested and treated. 

How might this impact my work?

Practical considerations

Legal and reporting considerations

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