Fig. 2

Compositional differences in the oral microbiota of individuals among the three groups at different time points after stroke. (A) Trial profile of cohort. The α diversity (Shannon index) (B) and richness (Chao1 index) (C) at different time points after stroke. D, E, F, G PCoA plots based on Bray‒Curtis distances are drawn to display the dynamic differences among the three groups at T1, T2, T5 and T7. Each point represents the composition of the oral microbiota of one participant. P values comparing the different groups were calculated using Wilcoxon tests, *p ≤ 0.05; **p ≤ 0.01; ***p ≤ 0.001;*among three group,# SAP compared with non,& VAP compared with non,%SAP compared with VAP. SAP stroke-associated pneumonia; VAP ventilator-associated pneumonia; PCoA principal coordinate analysis