Table 2 Summaries of the bacterial function description from the included metagenomic studies

Qi, et al. 2019 [5]

Folate biosynthesis;

Glycerophospholipid metabolism;

Biotin metabolism;

Zhang, et al. 2019 [22]

Folate biosynthesis;

cationic antimicrobial peptide resistance;

lipopolysaccharide biosynthesis;

phosphotransferase system;

fatty acid biosynthesis;

Chu, et al. 2020 [23]

Glycerophospholipid metabolism;

cationic antimicrobial peptide resistance;

lipopolysaccharide biosynthesis;

phosphotransferase system;

Yang, et al. 2022 [40]

Biotin metabolism;

fatty acid biosynthesis;