Table 1 Locations/names of the floor drain samples and bacterial log reductions in mixed biofilms after 300 ppm QAC treatment.

From: Impact of mixed biofilm formation with environmental microorganisms on E. coli O157:H7 survival against sanitization

Plant

A

B

O157 only

Drain location

Cooler 1

Cooler 2

Hotbox 1

Hotbox 2

Cooler 1

Cooler 2

Hotbox 1

Hotbox 2

 

Sample name

A-C1

A-C2

A-H1

A-H2

B-C1

B-C2

B-H1

B-H2

 

Biofilml log reductiona

1.5 (0.1)

1.6 (0.2)

1.5 (0.2)

2.0 (0.1)

1.8 (0.1)

3.0 (0.2)

1.3 (0.1)

1.6 (0.4)

 

O157 log reductionb

−0.2 (0.1)

1.5 (0.7)

1.0 (0.6)

2.6 (0.5)

2.2 (0.6)

2.4 (0.6)

2.7 (0.5)

3.2 (0.4)

3.4 (0.4)

  1. aLog reduction (log10 CFU/chip ± SD) of total bacterial counts after 300 ppm QAC treatment in mixed biofilms by environmental microorganisms collected from floor drains.
  2. bLog reduction (log10 CFU/chip ± SD) of viable E. coli O157:H7 cells after 300 ppm QAC treatment in mixed biofilms by environmental microorganisms collected from floor drains, or in E. coli O157:H7 single-strain biofilm.
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