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Mycoplasma genitalium, also known as MG or Mgen is the smallest bacterial sexually transmitted infection (STI). Most people with the infection don’t experience symptoms and it is not routinely tested without symptoms.
There are often no signs or symptoms for MG. If you do have symptoms, they can often take a while to appear and you might notice:
Signs and symptoms in females:
Signs and symptoms in males:
If left untreated MG may cause further complications for both females and males such as pelvic inflammatory disease (PID), premature birth and swelling of the testicles (men).
MG is linked with infertility but there are no studies to verify this.
MG is found in the semen (sperm) of men and vaginal fluids of women who have the infection. It can passed from one person to another through:
You don’t need to have had lots of partners and your partner doesn’t need to have experienced symptoms to pass it on to you.
You cannot get MG from kissing, hugging, sharing baths or towels, swimming pools, toilet seats or from sharing cups, plates or cutlery.
MG is often present at the same time as other infections such as chlamydia which can make it harder to diagnose.
The nurse or doctor will not routinely test people without symptoms, even if they have another STI such as chlamydia or gonorrhoea. This is because over-testing could lead to unnecessary treatment, which could lead to antibiotic resistance.
Testing for MG is really simple and usually involves a simple urine test or genital swab. For men, a urine sample is collected when the bladder has not been emptied for some time, when it’s likely the urine is most concentrated with bacteria. For women, a swab ist taken of the vagina and cervix.
If left untreated MG can develop a resistance to antibiotics and become difficult to treat.
MG is treated with the antibiotics. If diagnosed with MG you are advised to avoid sex until you and your partner have been treated. This is because you might pass the infection back to each other. Use condoms until you have a test 5 weeks after starting treatment to make sure you are clear of MG. This is because some antibiotics may not kill off the infection.
Tell the nurse or doctor if you are pregnant or think you may be, or if you are breastfeeding as you might need a different antibiotic to the routine ones used.
TELL YOUR PREVIOUS PARTNERS
It is important that you tell your current and any recent sexual partners (last six months) that you are being treated for MG, so that they can access treatment too.
All clinics offer to contact your partners either using a digital service called SXT, or send messages to them anonymously, inviting them to get checked for STIs. This is called partner notification and it doesn’t mention your name or information about your care.
Not an STI but STIs can trigger it.
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