Table 1. Gut microbiota composition in patients with Alzheimer’s disease.

Number	Gut microbiota composition in patients with Alzheimer’s disease	Reference
1	Firmicutes, Actinobacteria phylum and Eubacteriumrectale↓; Bacteroides and Shigella ↑	Cattaneo et al. (2017)
2	Prevotella, Sutterella, Haemophilus↓	Paley (2019)
3	Escherichia-Shigella and Desulfovibrio↑	Chen et al. (2020), Borsom et al. (2023)
4	Pseudomonas, Faecalibacterium, Fusicatenibacter, Blautia, and Dorea↑	Xi et al. (2021)
5	Candidatus Saccharibacteria phylum and Proteobacteria ↑	Heravi, Naseri & Hu (2023)
6	Saccharibacteria, Anaerotruncus, Vampirovibrio, and Alistipes  ↑;Dorea, Anaerostipes, Hallella, and Ruminococcus↓	Favero et al. (2022)
7	Helicobacter pylori↑	Xie et al. (2023)