Science of Sex: Vaginal Bacterial Transplants

October 1st, 2019

vaginal microbiota transplantation

According to recent estimates, our bodies consist of as much — or even more — bacteria than they do our own cells. While the exact numbers can vary, and researchers may occasionally disagree, bacteria help us function. Without the bacteria in our bodies, our bodies don’t work correctly. However, a bacterial imbalance or introduction of the wrong type of bacteria can lead to problems, namely, infections.

When it comes to sexual health, many people think of sexually transmitted infections. However, these are typically caused by viruses. Bacterial infections include bacterial vaginosis (BV) and infections of the cervix. These infections have traditionally been treated by antibiotics; however, this can lead to antibiotic resistance, which is an increasing concern especially given how frequently these infections reoccur. Furthermore, antibiotics can contribute to yeast infections.

Researchers are considering a new treatment option: vaginal bacterial transfers or vaginal microbiota transplantation. This would transfer the bacteria from a healthy vagina to a vaginal that has a bacterial imbalance. This procedure is not yet in practice and may never come to be. However, researchers are studying what would need to happen to make it a reality.

First, the ideal donor would have just a few bacteria. Specifically, there would not be a lot of Lactobacillus, which is what causes BV. People would need to be screened to see if they are a good match first via questionnaire. Then, swabs would take vaginal bacterial samples. Samples were tested for HPV and HIV before researchers moved on to bacterial analysis. It’s proposed that donors abstain from sex for 30 days before providing a donation, which can be self-collected.

This screening is important because samples could contain bacteria that would do more harm than good. For example, you might have read about two cases earlier this year where patients who underwent experimental fecal transplants, which has been undergoing experimentation as a possible treatment for rectal issues such as C. difficile infections, died. They received material from a donor that was tainted with E Coli. The specific train was antibiotic-resistant. Furthermore, the patients both had weakened immune systems.

With proper screening, this could be avoided. Since bacterial transplants of any form are still in their infancy — the fecal transplant hasn’t received FDA approval yet — now’s the time to eliminate the risk for when these procedures eventually become approved and used on patients.

A similar procedure known as vaginal seeding occurred when doctors would take samples of a birth parent’s vaginal bacteria and apply it to a newborn infant who was born through cesarian section. This practice started because it was believed that vaginal delivery transfers bacteria that can boost an infant’s immune system. While one study initially found limited success from the practice, a more recent study suggests that there is little evidence that vaginal seeding provides microbial benefits to infants and that health difference between vaginal and cesarian-born babies may be due to the antibiotics administered to the parent during birth.

Thus far, results from fecal transplants have been more promising, and vaginal microbiota transplantation may prove the same. However, it’s incredibly early in the game to make that assessment.

Further Reading


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