Skip to main content
. 2021 Mar 15;16:Doc12. doi: 10.3205/dgkh000383

Figure 1. Serratia marcescens microbiological screening.

Figure 1

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.