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Table 3 Classification of tested L. monocytogenes rods depending on the biofilm formation intensity based on the number of bacteria isolated from the polypropylene 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 valueaTotal
n = 96
Clinical strains
n = 58
Environmental strains
n = 38
Weak4.26–5.2919 (31.0)6 (15.8)0.01124 (25.0)
Moderate5.30–5.9115 (27.6)8 (21.1)0.28424 (25.0)
Strong5.92–6.8513 (22.4)11 (28.9)0.29324 (25.0)
Very strong6.86–7.9711 (19.0)13 (34.2)0.01524 (25.0)
  1. Italic values indicate significance of p value (p ≤ 0.05)
  2. ap value ≤ 0.05