This issue of Cell Host & Microbe highlights the opposite faces of Prevotella copri (P. copri). Tett et al. (2019) and Fehlner-Peach et al. (2019) unravel the complexity of gut dwelling P. copri, whereas Rolhion et al. (2019) explore the P. copri dark side with its ability to potentiate Listeria monocytogenes pathogenicity.
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