Effect of low-dose gaseous ozone on pathogenic bacteria

BMC Infectious Diseases

Table 2 Bacterial in vitro growth, at 24 hours and 48 hours, of isolates submitted to an O ₃/O ₂ gaseous mixture (O ₃ group), to 100% O ₂ (O ₂ group) and not submitted to gas treatment (Baseline group)

Bacterial strains	Culture duration	CFU / dish
		O₃ Group				O₂ Group				Baseline Group
		Plates (P)				Plates (P)				Plates (P)
		P1	P2	P3	P4	P1	P2	P3	P4	P1	P2	P3	P4
1= Escherichia coli – ATCC:25922	24 h	0	0	0	0	83	68	59	73	58	66	65	76
1= Escherichia coli – ATCC:25922	48 h	0	0	0	0	78	69	58	61	57	68	62	80
2= Staphylococcus aureus resistant to oxacillin –ATCC:29213	24 h	0	0	0	0	94	81	80	55	98	83	104	95
	48 h	0	0	0	0	88	74	85	49	75	89	104	90
3= Staphylococcus aureus susceptible to oxacillin – ATCC:25923	24 h	0	0	0	0	72	45	82	68	65	44	91	76
	48 h	0	0	0	0	70	47	75	69	66	39	94	73
4= Enterococcus faecalis resistant to vancomycin – ATCC: 51299	24 h	0	0	0	0	69	64	201	75	73	100	105	71
	48 h	0	0	0	0	79	78	207	82	68	97	106	57
5= ESBL producing Klebsiella pneumoniae susceptible only to carbapenems –clinical isolate from a patient.	24 h	0	0	0	0	65	75	153	71	87	113	117	80
	48 h	0	0	0	0	68	81	135	69	96	88	108	80
6= Acinetobacter baumannii resistant to carbapenem – clinical isolate from a patient.	24 h	0	0	0	0	226	205	201	162	158	165	159	206
	48 h	0	0	0	0	214	196	171	137	135	162	130	185
7= Acinetobacter baumannii susceptible only to carbapenem – ATCC:19606	24 h	0	0	0	0	70	60	58	70	63	65	63	67
	48 h	0	0	0	0	69	61	52	63	65	69	62	64
8= Pseudomonas aeruginosa susceptible to imipenem and meropenem-ATCC:27853	24 h	0	0	0	0	155	68	138	94	82	85	88	65
	48 h	0	0	0	0	110	79	97	94	83	72	66	69

ESBL: Extended-spectrum beta-lactamase; CFU: Colony-forming units; each experiment was repeated 4 times (Plates: P1 to P4).

ISSN: 1471-2334