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. 2021 Oct 21;162(2):548–561.e4. doi: 10.1053/j.gastro.2021.10.013

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The fecal concentration of acetic acid (A), propionic acid (B), butyric acid (C), valeric acid (D), hexanoic acid (E), isobutyric acid (F), isovaleric acid (G), and. L-isoleucine (H) in patients with COVID-19 and non–COVID-19 controls. The first stool sample collected after admission (baseline group) and the stool collected after discharge (postrecovery group) were used for the targeted metabolome analysis. ∗P <.05, ∗∗P < .01, and ∗∗P<.001 indicate statistical significance for mild, moderate, and severe/critical patients vs non–COVID-19 controls, determined using Mann-Whitney U test.