Table 3.
Association between gut microbiota and COVID-19.
| Authors | Type of study | Studied value | Association between gut microbiota and COVID-19 |
|---|---|---|---|
| Gu et al. (2020b) | Cross-sectional | Diagnostic | Yes |
| d’Ettorre et al. (2020) | Clinical trial | Therapeutic | Yes |
| Tang et al. (2020) | Cohort | Prognostic and diagnostic | Yes |
| Zuo et al. (2020b) | Case–control | None | Yes |
| Zuo et al. (2020a) | Case–control | Prognostic and therapeutic | Yes |
| Zuo et al. (2021a) | Cohort | Prognostic | Yes |
| Cao et al. (2021) | Cohort | Diagnostic and prognostic | Yes |
| Liu et al. (2021) | Clinical trial | Therapeutic (postinfection recovery) | Yes |
| Lv et al. (2021b) | Cohort | Diagnostic | Yes |
| Lv et al. (2021a) | Cohort | Diagnostic and prognostic | Yes |
| Yeoh et al. (2021) | Cohort | Prognostic | Yes |
| Prasad et al. (2021) | Cohort | Diagnostic and prognostic | Yes |
| He et al. (2021) | Case–control | None | Yes |
| Zhou et al. (2021) | Case–control | None | Yes |
| Moreira-Rosário et al. (2021) | Cross-sectional | Prognostic | Yes |
| Wu et al. (2021) | Case–control | Diagnostic and prognostic | Yes |
| Gaibani et al. (2021) | Case–control | Prognostic | Yes |
| Kim et al. (2021) | Case–control | Diagnostic (postinfection recovery) | Yes |
| Zuo et al. (2021b) | Case–control | Diagnostic and prognostic | Yes |
| Khan et al. (2021) | Case–control | Prognostic | Yes |
| Hegazy et al. (2021) | Cohort | Prognostic | Yes |
| Wang et al. (2021b) | Cohort | Therapeutic | Yes |