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Bacteria that colonize the human gastrointestinal tract are essential for good health.

Bacteria that colonize the human gastrointestinal tract are essential for good health. In this review, François Trottein, director of research CNRS Hauts-de-France at the CIIL and his colleagues, discuss mechanisms by which the gut microbiota arms the lung to control viral respiratory infections. They also summarize the impact of viral respiratory infections on the gut microbiota and discuss the effects of gut microbial imbalance on disease outcomes. The potential role of the lung-gut axis in coronavirus disease 2019 is addressed.