COVID-19(14) SARS-CoV-2(12) gut microbiota(11) Gut(11) Infection(10) Microbiome(9) intestinal(8) microbial(8) microbiota(8) gut microbiome(6) healthy(6) SARS-COV-2 infection(6) disease(5) coronavirus(5) Fatty acid(5) fecal(5) SCFAs(5) coronavirus disease(5) Bacteria(4) enzyme(4) Host(4) Immunity(4) controls(4) pandemic(4) 16S rRNA sequencing(4) Impact(4) promote(4) the SARS-CoV-2(4) disease severity(4) Effect(4)