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Mycoplasma Genitalium Infection: Symptoms, Causes, and Treatment

Posted on by Prof. Dr. Berkan Reşorlu

Mycoplasma genitalium infection is a disease caused by a microscopic bacterium that lacks a cell wall, is transmitted through sexual contact, and causes persistent inflammation in the reproductive and urinary tracts of both women and men. The main symptoms of this condition include severe burning during urination, unusual clear discharge, and persistent pain in the pelvic region. The treatment of this microorganism, which is structurally resistant to conventional medications, is carried out only with sequential and specific antibiotic combinations administered after a definitive diagnosis has been made through molecular tests. This condition, which can profoundly affect reproductive health, can be permanently eliminated from the body with specific medical protocols planned in a timely manner.

Definition of the Disease Mycoplasma genitalium is a sexually transmitted bacterium. It may cause urethritis, cervicitis, pelvic inflammatory disease (PID), and in some cases reproductive system complications. The infection may cause symptoms in both women and men or may remain completely asymptomatic.
Routes of Transmission It is most commonly transmitted through vaginal and anal sexual contact. Oral transmission is less common. Unprotected sexual intercourse increases the risk of transmission.
Risk Factors Unprotected sexual intercourse, multiple sexual partners, a previous sexually transmitted infection, and contact with an infected partner are the main risk factors.
Symptoms (In Men) Burning during urination, clear or white discharge from the urethra, irritation at the tip of the penis, itching, and groin pain may occur. Some people may have no symptoms.
Symptoms (In Women) Changes in vaginal discharge, burning during urination, pain during intercourse, bleeding after intercourse, lower abdominal pain, and signs of cervicitis may occur. In some women, the infection may progress silently.
Possible Complications If left untreated, it may increase the risk of pelvic inflammatory disease, chronic pelvic pain, and infertility in women. Persistent urethritis may develop in men.
Diagnostic Method The most reliable diagnostic method is the nucleic acid amplification test (NAAT/PCR). A first-catch urine sample may be used in men, while a vaginal or cervical swab sample may be used in women.
Antibiotic Resistance Mycoplasma genitalium may develop resistance, particularly to macrolide antibiotics. Fluoroquinolone resistance may also be seen in some regions. Therefore, treatment is planned according to resistance status whenever possible.
Treatment Approach Treatment is carried out with antibiotics in accordance with current guidelines. Antibiotic selection is determined according to resistance test results, if available, and the patient’s clinical condition.
Points to Consider During Treatment Antibiotic treatment must be completed in full. It is recommended to avoid sexual intercourse until treatment is completed and the period recommended by the healthcare professional has elapsed.
Evaluation of Sexual Partners Evaluating recent sexual partners and testing or treating them when considered necessary is important in preventing reinfection.
Follow-Up Test Depending on the risk of resistance, persistent symptoms, or the treatment used, the healthcare professional may recommend a post-treatment follow-up test (test of cure). The timing of the test is planned according to the treatment used.
Infection During Pregnancy When detected during pregnancy, the treatment plan is arranged by considering antibiotic options that are safe for both the mother and fetus.
Prevention Methods Correct and consistent condom use reduces the risk of transmission but does not eliminate it completely. Limiting the number of sexual partners and undergoing evaluation after risky contact are also important for prevention.
Risk of Reinfection After successful treatment, unprotected sexual contact with an infected partner may cause reinfection.
Prognosis With appropriate antibiotic treatment, the infection can be brought under control in many patients. However, due to antibiotic resistance, additional treatment or different antibiotics may be required in some cases.
Conditions Requiring Urgent Evaluation If severe lower abdominal pain, high fever, severe pelvic pain, suspected infection during pregnancy, severe testicular pain, or rapidly worsening symptoms develop, a healthcare institution should be consulted without delay.

How Does Mycoplasma genitalium Behave When It Enters the Body?

The most fundamental feature that makes this microorganism unique in the world of microbiology is that it lacks the protective layer called the cell wall, which is found in many other bacteria and gives them shape and durability. At first glance, the absence of a cell wall may be perceived as a weakness. However, many standard penicillin-derived antibiotics commonly used in medicine against infections attempt to destroy bacteria by targeting this cell wall. When they cannot find an outer wall to target, these widely used medications remain largely ineffective against the microorganism. This structural feature is one of the most important factors that make the infection difficult to treat with standard medications.

From the moment it enters the body, it adopts an almost parasite-like lifestyle at the cellular level. Because its capacity to produce its own energy is very limited, it attaches tightly to the epithelial cells lining the inner surface of the urinary tract or reproductive system. It sustains its life by using the sugars and nutrients of human cells. This attachment process generally progresses very slowly, but it lays the groundwork for constant irritation and persistent chronic inflammation in the tissues it contacts. Its slow reproduction may cause symptoms to appear even months later or allow the infection to remain silent for a long time.

What Are the Symptoms of Mycoplasma genitalium Infection in Men?

This infection may remain in the body for a long time without causing any symptoms, particularly in sexually active individuals. When the disease completes its silent incubation period and begins to produce clinical findings, men generally develop forms of urethritis that are not caused by gonorrhea and mean inflammation of the urinary tract. The complaints observed may significantly reduce the individual’s quality of life and create a psychologically exhausting process.

Symptoms may become more pronounced in the morning and may fluctuate slightly throughout the day. Unlike the very heavy and dark-colored purulent discharge seen in gonorrhea, a more transparent discharge is noticeable here. Patients generally notice staining in their underwear. In addition, a constant feeling of discomfort in the urinary canal is one of the main factors that make daily life very difficult.

The main symptoms observed in men are as follows:

  • Burning during urination
  • Stinging during urination
  • Clear discharge
  • Mucoid discharge
  • Itching in the urethra
  • Tenderness in the urethra
  • Dull pain in the groin
  • Pain during ejaculation

What Complaints Does Mycoplasma genitalium Infection Cause in Women?

Due to the nature of sexually transmitted infections, the disease has the potential to affect not only one individual but also the sexual partner at the same time. In women, the condition caused by this microorganism may tend to progress much more silently and deeply compared with men. While no complaints occur in many cases, the infection may disrupt the balance of the vaginal flora, progress toward the cervix, and cause inflammatory reactions known as cervicitis there.

This irritation in the cervix may cause unusual discharge that is difficult to notice in daily life or mild bleeding during intercourse. Due to the structure of female anatomy, the risk of the infection spreading upward, namely into the uterus and pelvic region, is always taken into consideration. The inflammation triggered by the infection at the cellular level may also weaken the natural protective barrier of the tissues, making it easier for other possible infections to settle in the area.

The main complaints encountered in women are as follows:

  • Abnormal vaginal discharge
  • Foul-smelling discharge
  • Pain during sexual intercourse
  • Bleeding after sexual intercourse
  • Intermenstrual bleeding
  • Pain in the lower abdominal region
  • Pelvic tenderness
  • Burning during urination

How Does Untreated Mycoplasma genitalium Affect Male Reproductive Health?

The infection does not tend to remain limited only to the areas close to the urinary opening. When it is not detected and managed appropriately in time, it carries the risk of ascending from the urinary canal and reaching vital organs deeper in the reproductive system. This ascending character of the bacterium may transform a simple urinary tract irritation into complex conditions that can last for months.

When it reaches the prostate gland, it may trigger prostatitis-like complaints that seriously impair the patient’s quality of life and cause a constant feeling of pressure in the pelvic region. If it spreads to the epididymis, the duct system located behind the testicles where sperm are stored and mature, epididymitis may develop. This condition manifests with swelling, increased warmth, and highly uncomfortable pain in the testicles. This long-term inflammatory process in the tissues may eventually leave fine scars and cause narrowing in the urinary canal. One of the greatest concerns is that this chronic inflammatory process may impair seminal fluid quality, negatively affect sperm health, and increase the risk of infertility.

What Risks Does Persistent Mycoplasma genitalium Infection Carry in Women?

The course of the microorganism in the female body may threaten a wide area extending from the cervix to the fallopian tubes and ovaries. When the silent inflammation that begins in the cervix spreads over time to the upper parts of the reproductive organs, it may turn into a very serious and painful syndrome called Pelvic Inflammatory Disease (PID). In addition to causing severe and chronic pain in the groin, this condition also has the potential to damage the anatomical structure of the reproductive organs.

Inflammation-related damage and adhesions that may occur in the fallopian tubes can cause the tubes to become blocked or narrowed. These anatomical impairments may prevent the fertilized egg from safely reaching the uterus, significantly increasing the likelihood of life-threatening conditions known as ectopic pregnancy. It is also thought that the chronic damage it causes in the internal tissues may make a healthy pregnancy more difficult, increase the risk of miscarriage, and lay the groundwork for tubal infertility. Therefore, detecting such insidious infections at an early stage in women is of great importance for preserving reproductive health.

Why Are Conventional Tests Inadequate in the Diagnosis of Mycoplasma genitalium?

One of the greatest disappointments experienced by patients who apply to urology or gynecology clinics is that routine test results come back clear even though their complaints continue. The main reason behind this situation is that the standard bacterial culture tests widely used in hospitals are not designed to detect this particular microorganism. By nature, this bacterium reproduces extremely slowly, struggles to survive in artificial culture media in the laboratory, and requires very specific conditions. Producing it in a laboratory through classical culture methods may take months, which is an impractical period in clinical medicine.

In addition, liquid culture kits commonly used on the market and designed to detect other milder members of the mycoplasma family cannot isolate this microorganism either. When the patient undergoes these standard tests, the results come back negative. This resulting false-negative result may lead the patient to believe that they do not carry an infection and to think that their complaints are psychological. Routine antibiotics prescribed through trial and error at this stage may, rather than weakening the bacterium, lay the groundwork for it to become even more resistant to medications. Therefore, using the correct diagnostic tools makes a major difference.

What Are the Most Accurate Methods and Samples for Diagnosing Mycoplasma genitalium?

The most reliable way to detect this hidden microorganism in the body is to search for its genetic material, namely its DNA, instead of trying to grow the bacterium itself. For this purpose, advanced molecular technologies called Nucleic Acid Amplification Tests (NAAT) or Multiplex PCR are used. The PCR method makes even the smallest piece of bacterial DNA in the sample visible and measurable by copying it millions of times in the laboratory. This method is considered the most sensitive and reliable diagnostic tool available in clinical practice.

However, no matter how advanced the device used is, the efficiency of the test decreases unless the sample is taken from the correct area under appropriate conditions. Selecting samples that contain the highest amount of genetic material according to the patient’s complaints, anatomical structure, and sexual history forms the heart of diagnosis.

Appropriate sample types that may be collected for laboratory examination are as follows:

  • First-catch urine sample
  • Urethral swab
  • Vaginal swab
  • Cervical swab
  • Anorectal swab

One of the most comfortable and accurate methods in men is the first-catch urine sample collected on the condition that the patient has not urinated for at least one or two hours. Cellular debris and bacteria accumulated on the wall of the urinary canal during the waiting period are transferred into the container with the first urine flow and create an excellent pool of genetic material for the PCR device.

Why Is Antibiotic Resistance a Major Problem in Mycoplasma genitalium Treatment?

Another important obstacle encountered after an accurate molecular diagnosis is the increasing antibiotic resistance worldwide. To survive, bacteria learn to protect themselves by making small changes, namely mutations, in their genetic codes against the medications to which they are exposed. Regional and national surveillance studies conducted in our country show that this microorganism has developed resistance genes at very high rates against the most fundamental antibiotic groups.

Resistance rates far above expectations are detected against macrolide antibiotics, which have traditionally been the first choice for this type of urogenital infection. By making changes in certain regions of its genetic structure, the bacterium makes it difficult for the medication to penetrate and perform its function. Similarly, genetic mutations are known to be rapidly increasing against fluoroquinolone medications, which are considered a second powerful weapon. The most challenging situation is when the bacterium simultaneously carries resistance genes against both medication groups. This condition, called multidrug resistance, indicates that the era of treatment with a single box of medication has largely ended for this infection. This picture clearly demonstrates that treatment cannot be carried out with hearsay information or over-the-counter antibiotic use.

What Treatment Plan Is Followed in Resistant Mycoplasma genitalium Cases?

Considering the progressively increasing resistance rates, simple and single-stage antibiotic treatments have been replaced by much more planned and strategic approaches. Current medical guidelines recommend sequential treatment strategies to break the bacterium’s defense mechanism against medications and increase the likelihood of cure. The basic logic of this strategy is based on using two separate antibiotics that work through different mechanisms one after another without interruption.

In the first stage of the treatment process, the aim is to reduce the overall bacterial load. Even if the first group of medications used cannot completely eliminate the microorganism, it stops its reproduction, significantly reduces its number, and weakens its resistance. As soon as the first stage is completed, a second and stronger antibiotic group is started immediately afterward. The microorganisms that have decreased in number and become weakened are largely cleared from the body through the effect of the second medication. This planned transition does not give the bacterium enough time to develop mutations and create a new defense shield. The number of sequential days and medication doses administered are determined specifically by the physician according to the patient’s general health condition and the extent of the infection.

The active ingredients frequently used in treatment protocols are as follows:

  • Doxycycline
  • Moxifloxacin
  • Azithromycin

What Are the Alternative Medication Options in Mycoplasma genitalium Treatment?

Regression of complaints is expected in the majority of cases in which sequential treatment strategies are applied. However, in clinical practice, highly persistent strains with multiple genetic mutations that continue to show resistance despite the sequential use of first- and second-line agents may also be encountered. In such refractory cases, the patient’s complaints continue and bacterial DNA may remain positive in follow-up tests.

When such conditions are encountered, treatment protocols are expanded and third-line alternative agents are introduced. This process requires more intensive clinical follow-up, and the duration of treatment is generally longer. Because the medications used may have a different side-effect profile compared with standard agents, the treatment process must be managed meticulously.

Alternative medication groups that may be considered in persistent and multidrug-resistant cases are as follows:

  • Pristinamycin
  • Minocycline
  • Sitafloxacin
  • Josamycin

These alternative agents significantly help remove the microorganism from the body in resistant cases that do not respond to other medications. Which medication is preferred may vary depending on the resistance profile in the region and the availability of the medication.

Why Is Partner Treatment Important in Mycoplasma genitalium Infection?

The management of a sexually transmitted infection does not consist only of the individual use of medication by the patient with clinical complaints. For treatment to be permanent and for the cycle of infection within society to be broken, the patient’s sexual partner must also be evaluated as an integral part of this medical process. This bacterium has an extremely high potential for contagiousness and transmission between sexual partners.

When treatment is administered only to the person with complaints, even if that person recovers, they remain at risk of acquiring the infection again from a silently infected partner during the first unprotected contact. In medical terminology, this vicious cycle is called reinfection. To break this cycle, it is of great importance that the current sexual partners of the diagnosed individual are also tested or treated simultaneously according to their risk status.

One of the most important rules to observe is abstaining from sexual intercourse during treatment. From the moment medication treatment begins until treatment is fully completed and recovery is confirmed by the physician, sexual abstinence is recommended to allow the tissues to rest and eliminate the risk of transmission. This approach also allows irritation in the tissues to decrease.

The basic principles to consider within partner management are as follows:

  • Informing the partner
  • Simultaneous medical evaluation
  • Simultaneous medication use
  • Sexual abstinence during treatment
  • Use of barrier methods

How Can It Be Determined That Mycoplasma genitalium Infection Has Completely Cleared?

After long and sometimes exhausting periods of antibiotic use, the issue patients are most curious about is whether their bodies have truly been cleared of this microorganism. Particularly in cases of high antibiotic resistance, relief of complaints may not always mean that the infection has completely ended. To confirm the success of treatment, a control mechanism called the “Test of Cure” in medical terminology is carried out.

Timing is critically important for the test of cure to produce accurate results. Patients generally want to undergo testing anxiously just a few days after taking the last medication. However, the PCR method cannot distinguish between live microorganisms and the genetic remnants of dead bacteria. DNA particles from bacteria killed by powerful antibiotics may remain in the infected area for several more weeks. Tests performed immediately after the medication is completed detect these nonliving remnants and cause the result to come back positive, namely a “false positive.” This situation may cause unnecessary panic in the patient and mislead the physician.

For this reason, the body must be given time to cleanse itself after the final antibiotic dose used. Follow-up samples collected after the waiting period is completed will reveal the result of treatment much more clearly. The timeline and steps that should be followed for a reliable follow-up test are as follows:

  • Waiting after medication completion
  • Remaining patient for at least three weeks
  • Clinical monitoring of complaints
  • Resampling from the appropriate area
  • Final evaluation with PCR

At the final stage, when the physician’s evaluation shows that the complaints have completely regressed and the follow-up test is negative, the infection is considered to have been largely eliminated from the body.

Frequently Asked Questions

Mycoplasma genitalium infection is a sexually transmitted bacterial infection. It is most commonly transmitted through unprotected vaginal or anal sexual contact. Some people may carry the infection for a long time without showing symptoms.

Men may experience burning during urination, urethral discharge, and groin pain. Women may develop vaginal discharge, pelvic pain, pain during sexual intercourse, and irregular bleeding. Some people may have no symptoms.

The most reliable diagnostic method is the use of nucleic acid amplification tests (NAAT/PCR). These tests, performed using a urine sample or genital swab sample, can demonstrate the presence of the bacterium with high accuracy.

Treatment is carried out with antibiotics. However, because antibiotic resistance may develop in the bacterium, medication selection must be planned by the physician according to current treatment guidelines and, when necessary, resistance status.

Untreated infection may cause complications such as urethritis in men, pelvic inflammatory disease in women, an increased risk of infertility, and chronic pelvic pain. Early diagnosis helps reduce these risks.

Yes. To prevent reinfection and reduce the spread of the infection, it is recommended that sexual partners also be evaluated and treated when considered necessary.

Yes. Failure to complete treatment, antibiotic resistance, or renewed unprotected sexual contact with an infected partner may cause the infection to develop again. Following the physician’s recommendations is of great importance.

Condom use, a monogamous sexual life, avoiding risky sexual behaviors, and applying to a healthcare institution at an early stage when symptoms of a sexually transmitted infection develop are effective prevention methods.

In some patients, particularly those with suspected resistance or persistent symptoms, a follow-up test may be performed in accordance with the physician’s recommendation to evaluate treatment success.

People with burning during urination, genital discharge, pelvic pain, or suspected sexually transmitted infection are advised to consult a specialist in urology, obstetrics and gynecology, or infectious diseases for diagnosis and treatment planning.

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