Table 4 Classification of tested L. monocytogenes rods depending on the biofilm formation intensity based on the number of bacteria isolated from the steel surface in a quantitative method
Intensity of biofilm formation by L. monocytogenes | Number of reisolated L. monocytogenes [log CFU × cm−2] | Number of strains depending on the origin [n (%)] | p value | Total n = 96 | |
|---|---|---|---|---|---|
Clinical strains n = 58 | Environmental strains n = 38 | ||||
Weak | 4.28–5.25 | 6 (10.3) | 18 (47.4) | p < 0.001 | 24 (25.0) |
Moderate | 5.26–5.87 | 7 (12.1) | 17 (44.7) | p < 0.001 | 24 (25.0) |
Strong | 5.88–6.80 | 21 (36.2) | 3 (7.9) | p < 0.001 | 24 (25.0) |
Very strong | 6.81–7.90 | 24 (41.4) | 0 (0.0) | p < 0.001 | 24 (25.0) |