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Concordance between results of PhaB assay with pyrazinamide at 160 μg/ml (pH 5.5) for 48 h and conventional methodology
| PhaB assay result | No. of isolates with stepped pH method result ofa:
|
% Concordance | |
|---|---|---|---|
| Sensitive | Resistant | ||
| 99% cutoff (n = 35) | |||
| Sensitive | 11 | 0 | |
| Resistant | 15 | 9 | 57 |
| 90% cutoff (n = 43) | |||
| Sensitive | 27 | 1 | |
| Resistant | 5 | 12 | 87 |
Yates's adaption of Marks's stepped pH method after 10 to 21 days, using a cutoff of 66 μg/ml.
