Calvarial tubercular osteomyelitic abscess.

The use of Cefoxitin MIC test has not been recommended by the CLSI-AST, but its performance was equivalent to Cefoxitin DD when using modiÞ ed breakpoints of less than or equal to 4 μg/ml for susceptible and greater than orequal to 8 μg/ml for resistance. The results of Cefoxitin DD method were better for isolates with Oxacillin MIC between 4-6 μg/ml (Table). Both Oxacillin DD and Cefoxitin DD gave reproducible results on 30 occasions for 10 MRSA and 10 MSSA strains however, Oxacillin DD gave inconsistent results for Þ ve strains with MIC 4-6μg/ml on several occasions in comparison to Cefoxitin DD which gave consistent resistant results for these Þ ve intermediate resistant strains. Our study also revealed that low level Oxacillin resistance was detected better by Cefoxitin DD test.