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Rectal swabs obtained through routine epidemiological screening for Serratia spp. that were reused in our study. “P” stands for patient, grey rectangles indicate rectal swabs that were positive through routine culture, and white rectangles indicate rectal swabs that were negative through routine culture. All the rectangles depict samples that were included in our study. * Signifies that the patient was discharged, and ǂ signifies exitus.
