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C=Staphylococcus aureus quality control strain NCTC® 8325; R=In-house Serratia marcescens reference strain; 1a, 2, 3 and 4=Serratia marcescens isolates (rectal specimens) of the four cluster patients showing the identical pulsotype (monoclonal pattern); 1b=Serratia marcescens blood culture isolate of patient 1 showing the same pattern as the rectal colonization isolate (1a); 5=Serratia marcescens isolate of a patient not belonging to the cluster.
