Abstract
The BD ProbeTec ET system for identification of Mycobacterium tuberculosis complex (MTBC) isolates from BACTEC 12B culture vials was evaluated in comparison with BACTEC NAP (p-nitro-alpha-acetylamino-beta-hydroxy-propiophenone) differentiation. Of 145 mycobacterial isolates tested, comprising 89 MTBC and 56 non-tuberculous mycobacteria (NTM), BD ProbeTec ET correctly identified 87 MTBC and 56 NTM but missed two MTBC. Three NTM were misidentified when NAP was incubated at 37 degrees C only. Overall sensitivity, specificity and positive and negative predictive values were respectively 97.8, 100, 100 and 96.6 % for the BD ProbeTec ET system and 100, 94.6, 96.7 and 94.6 % for NAP.
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