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Chapter 3
Table 3.5: The difference in mean log 10 density of cells recovered from tile and the 4 other surfaces (measured in Mean Log 10 CFU/coupon)
Tile
Glass Steel Polycarbonate Concrete
Strain N Diff P Diff P Diff P Diff P
S. Agona S09-0494 6/6 0.61 0.004 0.95 0.004 1.2 0.004 0.28 0.016
S. Agona SL483 6/6 1.61 0.004 2.23 0.004 2.06 0.004 0.44 0.004
S. Typhimurium S09-0419 6/6 1.61 0.004 2.23 0.004 2.06 0.004 0.44 0.004
S. Typhimurium SL1344 6/6 1.65 0.004 1.03 0.004 1.32 0.004 0.15 0.024
S. Enteritidis S09-0717 6/6 1.31 0.004 1.17 0.004 1.24 0.004 0.39 0.004
Table 3.5 displays the difference in mean log 10 density of cells recovered tile and from the 4 other surfaces after biofilm formation for 168
hours. The difference (Diff) was calculated by subtracting the mean log 10 density of cells recovered from tile from the mean log 10 density of
cells recovered from each of the other surface for each of the 5 strains examined. The strains incorporated 2 Salmonella enterica subspecies
enterica serovar Agona strains (S09-0494 and SL483), 2 S. Typhimurium strains (S09-0419 and SL1344) and 1 S. Enteritidis S09-0717. The
difference (Diff) was calculated by subtraction the mean log 10 density of cells recovered from glass, steel polycarbonate and concrete from the
mean log 10 density of cells recovered from tile. The significance of the differences is also denoted by the p values in table 3.7.
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