Table 4. Relative Abundance of Bacterial Phyla in Blood and Stool Samples from ME/CFS Patients and Health Controls.

	Blood Samples a		Stool Samples b
Phyla	ME/CFS Patients	Controls	ME/CFS Patients	Controls
Actinobacteria	10.52%	10.80%	0.58% c	1.06%
Bacteroidetes	17.84%	22.38%	27.71%	22.43%
Firmicutes	9.52%	7.89%	58.40%	65.29%
Other	7.97%	8.55%	9.71%	9.11%
Proteobacteria	54.14%	50.38%	3.59%	2.12%

ME/CFS, myalgic encephalomyelitis/chronic fatigue syndrome.

^a Mean relative abundance for 10 case and 10 control samples collected at baseline and 15 min, 48 hours, and 72 hours post-exercise challenge.

^b Mean relative abundance for 10 case and 10 control samples collected at baseline and 48 and 72 hours post-exercise challenge.

^c Significantly different from control (p < 0.05)