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The level of average absorbance at the wavelength λ = 570 nm for each group of clinical strains of K. pneumoniae (Kp) biofilm biomass created on polystyrene in TSB stained with a crystal violet (CV) solution; n of strains = 118 (100%). The letters a,b,c,d express the statistically significant differences (p > 0.5) between four analyzed groups of K. pneumoniae strains. Numbers in brackets indicate percentage of strains classified into each group.
