TABLE 1.

Comparison of results obtained by use of ORSA, MRSA_ID, C_MRSA, and TSB-ORSAa

MediumNo. of samples with the following results:Sensitivity (%)Specificity (%)
True positiveFalse negativeFalse positiveTrue negative
22-24 h48 h22-24 h48 h22-24 h48 h22-24 h48 h
ORSA17237255827857779283
MRSA_ID1823762031660779894
C_MRSA2022863430267739890
TSB-ORSA21228466427270738681
  • a Outcome of the comparison of ORSA, MRSA_ID, C_MRSA, and TSB-ORSA in terms of true positives, false negatives, false positives, and true negatives. A total of 366 swabs screened for MRSA were used for this comparison. Thirty swabs yielded strains of MRSA confirmed to be MRSA by mecA and nuc PCRs on one or more media within 48 h of incubation.