Could Hidden Infections Play a Role in Recurrent Pregnancy Loss? Insights From a New Study on Mycoplasma and Ureaplasma

Few experiences are as emotionally devastating as recurrent pregnancy loss. For couples who have lived through more than one miscarriage, the search for answers can feel endless. Standard workups typically examine hormones, genetics, autoimmune markers, and uterine anatomy, yet a significant percentage of cases remain unexplained. A newly published study in Fertility and Sterility (May 2026) shifts attention toward a quieter and often overlooked possibility: bacterial infections of the reproductive tract.

The research focused on two specific microorganisms, Mycoplasma and Ureaplasma, and whether they could be contributing to pregnancy loss in patients with no other identifiable cause?

What the Researchers Did

The team designed a prospective cohort study at a single fertility center. They followed 1,500+ patients with recurrent pregnancy loss and compared their findings against 200+ infertile controls. Each participant underwent testing for both Mycoplasma and Ureaplasma. When cultures came back positive, patients and their partners received a targeted course of antibiotics , followed by a test of cure to confirm the infection had cleared. Those who did not respond to first line treatment were offered alternative antibiotics.

This is a meaningful design because it did not stop at identification. It treated the infections, retests, and then monitors what happens with subsequent pregnancies.

What the Study Found

The results were striking. Patients with recurrent pregnancy loss were considerably more likely than controls to test positive for Mycoplasma and/or Ureaplasma.

The treatment piece is where the findings become especially interesting. Over 95% of patients achieved a negative confirming the infection was successfully eradicated after their first course of antibiotics. And among those who were successfully treated, live birth rates climbed significantly.

In other words, identifying and clearing these infections appeared to make a measurable difference in outcomes.

The Importance of this Research

Mycoplasma and Ureaplasma are not newcomers to reproductive medicine. They have been studied in connection with chronic endometritis, infertility, preterm labour, and pelvic inflammatory disease for quite some time. What this study adds is fresh prospective evidence that they may play a role in recurrent pregnancy loss specifically, and that treatment is not just possible but appears to improve the chances of carrying a future pregnancy to term.

For patients who have endured multiple losses without a clear explanation, this kind of testing represents another avenue worth discussing with their care team.

It is also a reminder that the reproductive microbiome plays a very important role in reproductive health. Inflammation in the uterine and cervical environment, even when subtle and symptom free, might influence implantation, placental development, and the maintenance of a pregnancy. As research continues to explore the connections between infection, immunity, and fertility, our understanding of so called unexplained loss is gradually becoming 'more explained.'

A Holistic Perspective

From an integrative and naturopathic perspective, this study reinforces something many of us have long observed in clinical practice. Reproductive health is rarely about a single organ or hormone. It is shaped by inflammation, the microbiome, immune balance, nutrient status, and the broader terrain of the body. When we widen the lens during a fertility workup, we often uncover more of the story.

Complementary and alternative approaches that support immune function, nurture a balanced vaginal and gut microbiome, address chronic inflammation, and optimize preconception health may all have a place in the broader picture of recurrent pregnancy loss care. None of these replace appropriate medical evaluation and treatment, but they can complement it with meaningful precision.

For anyone navigating this painful journey, the most important takeaway is this. There are still questions worth asking, tests worth considering, and avenues worth exploring. A second opinion or a more expanded workup can sometimes uncover what earlier evaluations have missed.

Conclusion

This newly published research is one prospective cohort, and more research will continue to confirm and refine its findings. Still, it adds important weight to the conversation around infectious contributors to pregnancy loss, and it offers a hopeful note for patients who feel they have run out of options. Sometimes the answer is closer than expected, hiding in a place most workups have not yet thought to look.

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Disclaimer: This blog is for informational purposes only and should not be taken as medical advice. Always consult with your Naturopathic Doctor before starting any new supplement, especially during fertility treatments like IVF.

About Dr. H. Singh, ND

Dr. H. Singh is a Fertility Naturopath based in Ottawa with over ten years of experience focusing exclusively on reproductive health.

He works with individuals and couples across Ontario and Quebec, supporting patients trying to conceive naturally or alongside treatments such as IUI and IVF.

Care focuses on evidence informed strategies to support egg quality, sperm health, hormonal balance, implantation, and early pregnancy.