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0.1 ≤ OD < 0.4
Weak Biofilm Former (WBF)
0.4 ≤ OD < 0.8
Intermediate Biofilm Former (IBF)
OD ≥ 0.8
Strong Biofilm Former (SBF)
Percentage of P. mirabilis strains displaying resistance to 5 different classes of antibiotics and percentage of multidrug resistant P. mirabilis strains in each biofilm group.