Influence of age, sex, and diet on asymptomatic colonization of infants with Clostridium difficile
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Updated: Aug 8, 2026

Culturing and Maintaining Clostridium difficile in an Anaerobic Environment
Published on: September 14, 2013
Insights
Clostridium difficile antigens were found in 40% of infant stool samples. Formula-fed infants showed significantly higher C. difficile colonization rates compared to exclusively breast-fed infants.
Area of Science:
- Microbiology
- Pediatrics
- Gastroenterology
Background:
- Clostridium difficile is an opportunistic pathogen.
- Infant gut microbiome development is crucial for health.
- Understanding C. difficile colonization in infants is important.
Purpose of the Study:
- To determine the prevalence of Clostridium difficile antigens in infant stool samples.
- To investigate the association between feeding practices and C. difficile colonization in infants.
- To explore potential variations in colonization by age and sex.
Main Methods:
- Stool samples were collected from 107 infants aged 1 to 52 weeks.
- Clostridium difficile antigens were detected using counterimmunoelectrophoresis.
- Infant feeding methods (exclusive breastfeeding, formula, mixed) were recorded.
Main Results:
- 40% of infant stool samples tested positive for C. difficile antigens.
- Infants fed formula had a significantly higher colonization rate (62%) compared to exclusively breast-fed infants (16%).
- Infants receiving both breast milk and formula/solids showed intermediate colonization rates (35%).
- No significant variation in colonization was observed based on infant age or sex.
Conclusions:
- Feeding practices, particularly formula feeding, are strongly associated with Clostridium difficile colonization in infants.
- These findings highlight the need to consider infant feeding in the context of C. difficile pathogenesis.
- Further research is warranted to understand the clinical implications of C. difficile colonization in infancy.
Abstract:
A total of 40% of 107 stool samples from infants 1 to 52 weeks of age were found to contain Clostridium difficile antigens, detected by counterimmunoelectrophoresis. Within the group tested, there was no detectable variation by age or sex. Infants fed formula were nearly four times more likely to carry C. difficile than were those exclusively breast fed (62 versus 16%), whereas breast-fed infants also receiving formula or solids had an intermediate rate of colonization (35%). The distributions were similar when a subgroup with the highest levels of antigen was assessed separately. These data will be useful in considering potential pathogenic activities of C. difficile colonization in infancy.
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