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  1. ; ; ; ; (, ChemBioChem)
    Abstract The members of the infant microbiome are governed by feeding method (breastmilk vs. formula). Regardless of the source of nutrition, a competitive growth advantage can be provided to commensals through prebiotics – either human milk oligosaccharides (HMOs) or plant oligosaccharides that are supplemented into formula. To characterize how prebiotics modulate commensal – pathogen interactions, we have designed and studied a minimal microbiome where a pathogen,Streptococcus agalactiaeengages with a commensal,Streptococcus salivarius. We discovered that whileS. agalactiaesuppresses the growth ofS. salivariusvia increased lactic acid production, galacto‐oligosaccharides (GOS) supplementation reverses the effect. This result has major implications in characterizing how single species survive in the gut, what niche they occupy, and how they engage with other community members. 
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