Virulence factors of Enterococcus strains isolated from patients with inflammatory bowel disease

Table 4 Mean amounts of hydrogen peroxide (in mmol/L) produced in vitro after 4 and 24 h by the tested strains

Source	Strains	H2O2 production (mmol/L) after 4 h	H2O2 production (mmol/L) after 24 h
Crohn's disease	Enterococcus faecalis 12A/1	0	0
	Enterococcus faecalis 31B	0	0
	Enterococcus faecalis 51A/1	0	0
	Enterococcus faecium 3A	0	0
	Enterococcus faecium 57A	0	0
	Enterococcus faecium 19B	0	0.3
	Enterococcus avium 51A/2	0	0.3
	Enterococcus avium 25B	0	0.3
	Enterococcus avium 10A	0.3	1
Ulcerative colitis	Enterococcus faecalis 35A	0	0
	Enterococcus faecalis 48A	0	0
	Enterococcus faecalis 77A	0	0
	Enterococcus faecalis 32B	0	0
	Enterococcus avium 40A	0	0
	Enterococcus avium 34A/2	0	0.3
	Enterococcus avium 40B	0	0
Control	Enterococcus faecalis 5B	0	0
	Enterococcus faecalis 27B/1	0	0
	Enterococcus faecalis 46B	0	0
	Enterococcus faecalis 55B	0	0
	Enterococcus faecalis 66B	0	0
	Enterococcus faecium 27B/2	0	0.3
	Enterococcus faecium 30B	0	0
	Enterococcus avium 15B/1	0.3	1
	Enterococcus avium 16B/1	0	0
	Enterococcus avium 27B/3	0	0.3
	Enterococcus durans 15B/2	0	0
	Enterococcus durans 16B/2	0	0

The measurement of H₂O₂ was performed with the use of colorimetric method: Merckoquant peroxide test strips.