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Table 1 Colony counts obtained from coated and non-coated surfaces contaminated with microorganisms for 0 − 48 hours

From: Biocidal activity of metalloacid-coated surfaces against multidrug-resistant microorganisms

Microorganisms Colony counts in average cfu (standard deviation) obtained from wires 0 − 48 hours after contamination with various microorganisms1. Data are from five replicate experiments. P 2
  Wires 0 hr 2 hr 4 hr 6 hr 24 hr 48 hr  
Pseudomonas aeruginosa coated > 2000 (nc) 1140 (89) 464 (42) 114 (60) 17 (12) 2 (1)  
  non-coated > 2000 (nc) 1540 (89) 1140 (167) 1060 (89) 220 (81) 33 (21) < 0.001
Acinetobacter baumannii coated 1440 (89) 430 (110) 72 (38) 69 (53) 21 (30) < 1 (nc)  
  non-coated 1420 (84) 1000 (0) 590 (55) 520 (45) 67 (49) < 1 (nc) < 0.001
Escherichia coli coated > 2000 (nc) 790 (55) 440 (47) 556 (38) 46 (8) < 1 (nc)  
  non-coated > 2000 (nc) 1760 (152) 1500 (0) 1620 (164) 90 (70) 2 (1) < 0.001
Klebsiella pneumoniae coated 1140 (nc) 860 (89) 760 (42) 630 (60) < 1 (nc) < 1 (nc)  
  non-coated 1140 (114) 1040 (55) 940 (55) 880 (45) 700 (71) 2 (2) < 0.001
Enterobacter cloacae coated > 2000 (nc) 1940 (89) 1500 (0) 1020 (45) 810 (22) 2 (1)  
  non-coated > 2000 (nc) > 2000 (nc) > 2000 (nc) 1480 (45) 569 (321) 2 (2) 0.031
Mu50 Staphylococcus aureus coated 1260 (55) 438 (36) 5 (2) 3 (7) < 1 (nc) < 1 (nc)  
  non-coated 1280 (84) 1060 (55) 980 (45) 760 (55) 11 (8) < 1 (nc) < 0.001
PVL Staphylococcus aureus coated > 1500 (nc) 770 (45) 540 (89) 108 (16) < 1 (nc) < 1 (nc)  
  non-coated > 1500 (nc) 1240 (55) 880 (27) 770 (45) 15 (12) < 1 (nc) < 0.001
Enterococcus faecium coated 1220 (110) 124 (33) 42 (26) 11 (5) < 1 (nc) < 1 (nc)  
  non-coated 1480 (45) 470 (76) 350 (35) 306 (26) 3 (2) < 1 (nc) < 0.001
Clostridium difficile coated 280 (45) 88 (12) 86 (15) 54 (15) 46 (12) 55 (22)  
  non-coated 300 (0) 100 (17) 71 (10) 62 (15) 55 (4) 43 (9) 0.328
Candida albicans coated 458 (62) 319 (23) 143 (38) 130 (25) 11 (7) < 1 (nc)  
  non-coated 710 (86) 482 (63) 338 (24) 336 (32) 4 (4) < 1 (nc) < 0.001
Aspergillus fumigatus coated 123 (22) 101 (9) 43 (12) 28 (7) 11 (4) 4 (4)  
  non-coated 162 (44) 96 (18) 41 (9) 41 (9) 34 (5) 2 (1) 0.061
  1. Nc: not calculable; 1at t0 and after 2, 4, 6, 24 or 48 hours of storage, contaminated leadwire sections were rolled on blood agar plates. Plate colonies were counted after incubation for 48 hours at 37°C; 2Colony counts were compared using the Wilcoxon signed-rank test to determine statistical significance.