Table 2.
Comparative Accuracy for NTM Identification using VITEK MS version 3.2 for identifying Non-Tuberculous Mycobacterium (NTM) directly from liquid medium compared to the traditional solid medium method.
| NTM Species | Samples Tested | Number of isolates Correctly Identified by VITEK MS from Solid Medium | Number of isolates Correctly Identified by VITEK MS from Liquid Medium |
|---|---|---|---|
| Mycobacterium avium complex (MAC) | 11 | 11 | 9 |
| Mycobacterium fortuitum | 5 | 5 | 5 |
| Mycobacterium abscessus | 4 | 4 | 4 |
| Mycobacterium kansasii | 4 | 4 | 4 |
| Mycobacterium chelonae | 3 | 3 | 2 |
| Mycobacterium mucogenicum | 2 | 2 | 2 |
| Mycobacterium gordonae | 1 | 1 | 1 |
| Mycobacterium xenopi | 1 | 1 | 1 |
| Mycobacterium scrofulaceum | 1 | 1 | 1 |
| Mycobacterium marinum | 2 | 2 | 2 |
| Mycobacterium szulgai | 1 | 1 | 0 |
| Mycobacterium riyadhense | 1 | 0 | 0 |
| Mycobacterium conceptionense | 1 | 0 | 0 |
| Total identified | 35 | 31 | |
| Overall Accuracy of test method %a | 94.5 | 83.7 | |
| Accuracy of test method based on VITEK MS database %b | 100 | 88.5 | |
a
Accuracy to total NTM samples.
b
Accuracy after excluding M. riyadhense and M. conceptionense.