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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

From: Comparison of the intensity of biofilm formation by Listeria monocytogenes using classical culture-based method and digital droplet PCR

Intensity of biofilm formation by L. monocytogenesNumber of reisolated L. monocytogenes [log CFU × cm−2]Number of strains depending on the origin [n (%)]p valueTotal
n = 96
Clinical strains
n = 58
Environmental strains
n = 38
Weak4.28–5.256 (10.3)18 (47.4)p < 0.00124 (25.0)
Moderate5.26–5.877 (12.1)17 (44.7)p < 0.00124 (25.0)
Strong5.88–6.8021 (36.2)3 (7.9)p < 0.00124 (25.0)
Very strong6.81–7.9024 (41.4)0 (0.0)p < 0.00124 (25.0)