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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.