Fig. 2
From: Mapping the output of the global literature on the links between gut microbiota and COVID-19
Analysis of research hotspots using cluster mapping. The VOSviewer software was used to evaluate words that appeared at least 20 times in titles and abstracts. The larger the circle of the keyword, the more frequently it appeared. The terms were classified into three clusters: “COVID-19 is associated with an altered upper respiratory tract microbiome” (blue cluster); “the effect of antibiotics on the gut microbiome” (green cluster); and “patient nutrition and probiotic therapy in COVID-19” (red cluster)