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Figure

Figure 1: Serratia marcescens microbiological screening

A: MacConkey agar with a colistin disk showing the growth of Klebsiella oxytoca (white arrows) and Serratia marcescens (black arrows); Serratia marcescens colonies are only visible within the colistin inhibition zone; B: Colistin inhibition zone with Serratia marcescens colonies in detail; C: Example of MacConkey agar without a colistin disk; Serratia marcescens colonies are masked by the more abundant species (Klebsiella oxytoca); D: Pure culture of Serratia marcescens, which is not inhibited by colistin due to intrinsic resistance.