Do Some Gut Bacteria in Preterm Infants Protect Against Serious Diseases?

Bacteria present in the intestines of very premature babies may play a key role in their health. Recent research shows that certain strains of Clostridium, particularly Clostridium perfringens, are capable of breaking down complex sugars found in breast milk, called oligosaccharides. These sugars are not digestible by humans but serve as food for beneficial bacteria.

Scientists have discovered that these bacteria produce useful substances such as short-chain fatty acids and other compounds that help reduce inflammation and strengthen the intestinal barrier. They also limit the growth of harmful microbes often found in the intestines of preterm infants. Additionally, they promote the development of other protective bacteria, such as bifidobacteria.

An important observation concerns a particular strain of Clostridium perfringens that does not produce a dangerous toxin called perfringolysin O. This strain is more common in healthy preterm infants than in those with severe intestinal diseases. It even appears to protect the intestine from damage and inflammation, unlike other more aggressive strains.

These findings suggest that certain gut bacteria could help prevent complications in preterm infants. They act by transforming breast milk sugars into beneficial molecules, supporting natural defenses, and balancing the microbiome. This opens avenues for better understanding how breast milk and gut bacteria influence the health of fragile newborns.

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Official Study Source

DOI: https://doi.org/10.1038/s41564-026-02297-4

Title: Clostridia from preterm infants metabolize human milk oligosaccharides to suppress pathobionts and modulate intestinal function in organoids

Journal: Nature Microbiology

Publisher: Springer Science and Business Media LLC

Authors: Jonathan A. Chapman; Andrea C. Masi; Lauren C. Beck; Hannah Watson; Gregory R. Young; Hilary P. Browne; Yan Shao; Raymond Kiu; Andrew Nelson; Jennifer A. Doyle; Pawel Palmowski; Márton Lengyel; James P. R. Connolly; Christopher A. Lamb; Andrew Porter; Trevor D. Lawley; Lindsay J. Hall; Nicholas D. Embleton; John D. Perry; Janet E. Berrington; Christopher J. Stewart