Table 3.

Relative abundance (%, mean ± SD) for the ten most common bacterial genera in groups of participants

	Relative abundance (%, mean ± SD)
	Controls	Cases	AD	MCI	SCD
Fusobacterium	17.97 ± 11.54	19.64 ± 11.77	17.62 ± 11.69	17.40 ± 9.02	23.61 ± 13.08
Porphyromonas	6.16 ± 16.20	5.58 ± 11.17	7.30 ± 13.12	5.37 ± 11.38	4.04 ± 8.59
Capnocytophaga	5.47 ± 5.14	6.10 ± 5.59	6.14 ± 5.89	6.27 ± 5.20	5.90 ± 5.72
Treponema	4.56 ± 4.91	5.38 ± 5.75	6.64 ± 7.16	5.55 ± 5.51	3.97 ± 3.85
Prevotella	3.91 ± 5.21	5.21 ± 4.30	5.21 ± 4.79	5.43 ± 3.17	5.02 ± 4.71
Campylobacter	4.25 ± 2.56	4.75 ± 2.57	4.48 ± 2.43	4.60 ± 2.12	5.14 ± 3.02
Streptococcus	6.29 ± 6.38	4.16 ± 4.68	4.08 ± 5.06	4.22 ± 3.74	4.19 ± 5.10
Corynebacterium	4.96 ± 6.39	4.46 ± 4.90	3.94 ± 5.08	4.84 ± 3.95	4.65 ± 5.48
Rothia	6.18 ± 9.40	3.95 ± 7.52	3.71 ± 8.55	4.38 ± 8.02	3.81 ± 5.95
Actinomyces	5.66 ± 7.29	3.30 ± 3.44	2.91 ± 3.15	3.00 ± 3.11	3.93 ± 3.95