Were you treated for an "unknown infection" and antibiotics didn't help? It might be this bacterium

Imagine: you were prescribed antibiotics for an infection, but there's no improvement. The doctor shrugs and changes the drug. A familiar story? Perhaps you've encountered Mycoplasma hominis — a bacterium that doesn't behave like the others.

What kind of beast is this and where does it come from?

Mycoplasma hominis is a bacterium that lives in the urogenital system. It was first discovered in 1937. In people with a vagina, it occurs much more often than in people with a penis. According to some estimates, 20–50% of women of reproductive age have it. But here's the paradox: in most, it causes no symptoms. That is, millions of people live with it and don't even suspect. It is transmitted through vaginal, anal, and oral sex, and also from a pregnant woman to the child during childbirth.

Why is it so hard to catch and treat?

The trick of mycoplasma is that it lacks a rigid cell wall. Common antibiotics that destroy the bacterial wall (penicillins and their relatives) simply don't work against it. Therefore, the doctor is forced to prescribe other, less common drugs. Plus, diagnosis is not part of standard screening: to detect it, a special molecular test or PCR is needed. A doctor can suspect it only if there are symptoms, and they are often absent. Symptoms, if they appear, are quite vague: unusual discharge (from the penis, vagina, or rectum) and urinary problems — frequent urges, stinging, burning.

Is it even treatable?

Yes, it is treatable. And even completely curable. The main thing is to take the full course of antibiotics as prescribed by the doctor and abstain from sex with other people during treatment. This is the most effective thing you can do to avoid passing the infection on. If you stop taking the pills halfway, the bacterium can survive and return.

What are the long-term risks?

The worst part is if it is left untreated. Mycoplasma hominis is associated with pelvic inflammatory disease (PID) — a serious infection of the uterus and fallopian tubes. And untreated PID can lead to infertility. The effect of mycoplasma on fertility is still being studied, but its link to reproductive complications is already known. So it's not worth hoping for the best.

How to protect yourself?

The standard and most reliable way is barrier contraception. Condoms and latex dams (for oral sex) reduce the contact of fluids and the risk of transmission. If you suspect you might have been infected, or if sex was not consensual, you have the right to testing and treatment. It's not shameful, it's taking care of yourself.

Mycoplasma hominis is not rare and not a death sentence. But it serves as a good reminder: if symptoms persist and treatment doesn't help, it's worth digging deeper and discussing non-standard options with your doctor.