Doctors Warn Against Vaginal Seeding

A group of Danish obstetricians notes that the procedure carries risks and that there is little evidence supporting its benefits to the infant microbiome.

Written byJef Akst
| 1 min read

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FLICKR, CONTROLADOMore than 90 percent of surveyed Danish obstetricians have been asked about vaginal seeding, a procedure in which swabs of vaginal fluid are applied to babies born via cesarean section in an attempt to expose them to microbes they would have collected had they been delivered vaginally, according to a report published this week (August 22) in BJOG: An International Journal of Obstetrics and Gynaecology. But the procedure may not be safe, and the existing literature does not provide a strong case for its benefits, the report authors warn. It “could do more harm than good,” the authors write.

The primary risk is exposure to harmful bacteria, such as group-B streptococcus and E. coli. And no carefully controlled studies have been performed on large numbers of infants to assess whether the procedure carries with it the assumed benefits of protecting against allergies and other immune-based disorders. “[I]t’s a fascinating thought that you’re able to mimic nature by doing the seeding, but it’s based on some theoretical thoughts and we don’t have evidence to support it,” report coauthor Tine Clausen, a consultant at Nordsjaellands Hospital in Denmark, tells BBC News.

Patrick O’Brien of the Royal College of Obstetricians and Gynaecologists agrees. “There is no robust evidence to suggest that vaginal seeding has any associated benefits,” he tells BBC News. “We would therefore not recommend it ...

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  • Jef (an unusual nickname for Jennifer) got her master’s degree from Indiana University in April 2009 studying the mating behavior of seahorses. After four years of diving off the Gulf Coast of Tampa and performing behavioral experiments at the Tennessee Aquarium in Chattanooga, she left research to pursue a career in science writing. As The Scientist's managing editor, Jef edited features and oversaw the production of the TS Digest and quarterly print magazine. In 2022, her feature on uterus transplantation earned first place in the trade category of the Awards for Excellence in Health Care Journalism. She is a member of the National Association of Science Writers.

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