Evaluation of CHROMagar™-Serratia agar, a new chromogenic medium for the detection and isolation of Serratia marcescens

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Abstract
A comparative analysis of the performance of the new selective chromogenic CHROMagar™-Serratia culture medium for detection and isolation ofSerratia marcescenswas undertaken. A total of 134 clinical isolates (95S. marcescenswith and without carbapenemase production and 39 non-S. marcescensisolates) and 96 epidemiological samples (46 rectal swabs and 50 from environmental surfaces) were studied. Diagnostic values when compared with CHROMagar™-Orientation medium were 96.8% sensitivity, 100% specificity, 100% positive predictive value and 88.5% negative predictive value. In conclusion, CHROMagar™-Serratia shows an excellent ability for differentiation ofS. marcescensamong clinical isolates and in environmental samples.

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