Children gut microbiota exhibits a different composition and metabolic profile after exposure to and increases its sporulation.

infection (CDI) is one of the main public health concerns in adults, while children under 2 years of age are often colonized asymptomatically. In both adults and children, CDI is strongly associated with disturbances in gut microbiota. In this study, an model of children gut microbiota was challenged with vegetative cells or a conditioned media of six different toxigenic strains belonging to the ribotypes 027, 078, and 176. In the presence of or conditioned medium the children gut microbiota diversity decreased and all main phyla (, and ) were affected. The NMR metabolic spectra divided exposed children gut microbiota into three clusters. The grouping correlated with nine metabolites (short chain fatty acids, ethanol, phenolic acids and tyramine). All strains were able to grow in the presence of children gut microbiota and showed a high sporulation rate of up to 57%. This high sporulation rate in combination with high asymptomatic carriage in children could contribute to the understanding of the reported role of children in transmissions.