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Table 1 Mean log 10 -reduction of two surface disinfectants against un-passaged and passaged isolates from contaminated use-solutions

From: Poorly processed reusable surface disinfection tissue dispensers may be a source of infection

Bacterial species (origin) Surface disinfectant, concentration (exposure time) Passage 0 Passage 5
Achromobacter species 3 (dispenser isolate) Mikrobac forte 1% (0.5 h) ≥ 6.04 ≥ 6.80
  Mikrobac forte 0.5% (1 h) 4.61 ± 0.17 ≥ 6.76
  Mikrobac forte 0.25% (4 h) 2.39 ± 0.13 4.43 ± 0.09
Serratia marcescens (dispenser isolate) Mikrobac forte 1% (0.5 h) 0.08 ± 0.04* 6.82 ± 0.62
  Mikrobac forte 0.5% (1 h) 0.08 ± 0.06* 2.38 ± 0.03
  Mikrobac forte 0.25% (4 h) 0.00 ± 0.02* < 1.68
Achromobacter xylosoxidans (ATCC 27061) Mikrobac forte 1% (0.5 h) ≥ 7.35 n.a.
  Mikrobac forte 0.5% (1 h) 6.29 ± 1.02 n.a.
  Mikrobac forte 0.25% (4 h) 6.28 ± 0.16 n.a.
Achromobacter species 3 (dispenser isolate) Incidin plus 1% (0.5 h) 0.03 ± 0.06 4.59 ± 0.06
  Incidin plus 0.5% (1 h) 0.06 ± 0.04 2.37 ± 0.01
  Incidin plus 0.25% (4 h) 0.09 ± 0.06 < 2.27
Achromobacter xylosoxidans (dispenser isolate) Incidin plus 1% (0.5 h) 0.05 ± 0.03 ≥ 7.02
  Incidin plus 0.5% (1 h) 0.02 ± 0.01 5.42 ± 0.13
  Incidin plus 0.25% (4 h) 0.00 ± 0.04 4.58 ± 0.07
Achromobacter xylosoxidans (ATCC 27061) Incidin plus 1% (0.5 h) ≥ 7.18 n.a.
  Incidin plus 0.5% (1 h) ≥ 7.18 n.a.
  Incidin plus 0.25% (4 h) ≥ 7.19 n.a.
  1. Achromobacter species 3, Achromobacter xylosoxidans and Serratia marcescens isolated from passages 0 and 5; n = 3; dirty conditions; *passage 1 was used due to the co-contamination with Achromobacter species 3; n.a = not applicable.