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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)

From: Effect of low-dose gaseous ozone on pathogenic bacteria

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