The Gut Microbiome and Butyrate Differentiate Clostridioides difficile Colonization and Infection in Children

Area of Science:

• Microbiology
• Gastroenterology
• Pediatrics

Background:

• Clostridioides difficile infection (CDI) causes significant illness, but asymptomatic colonization also occurs.
• Toxins alone do not distinguish between CDI and asymptomatic colonization in children.
• Other factors, like the gut microbiome and metabolites, may influence CDI development.

Purpose of the Study:

• To investigate differences in the intestinal microbiome and butyrate levels between children with CDI and asymptomatic colonization.
• To identify microbial and metabolic factors associated with symptomatic CDI versus colonization.

Main Methods:

• A case-control study compared 55 children with symptomatic CDI to 50 asymptomatic children colonized with C. difficile.
• Stool samples were analyzed using 16S rRNA sequencing for microbiome composition.
• Butyrate levels were quantified using liquid chromatography-mass spectrometry.

Main Results:

• Symptomatic CDI was strongly associated with altered gut microbial abundance, including increased Escherichia/Shigella and Haemophilus, and decreased Faecalibacterium and Bifidobacterium.
• A depletion in microbial butyrate producers and fecal butyrate was observed in children with symptomatic CDI compared to those with asymptomatic colonization.
• Gut microbiota composition differences were more significant than clinical factors in distinguishing CDI status.

Conclusions:

• Significant differences exist in the gut microbiota and butyrate levels between asymptomatic C. difficile colonization and symptomatic CDI in children.
• These microbial and metabolic alterations suggest a potential role in the pathogenesis of symptomatic CDI.