Tuberculosis Research and Treatment / 2017 / Article / Tab 3

Research Article

Using Reduced Inoculum Densities of Mycobacterium tuberculosis in MGIT Pyrazinamide Susceptibility Testing to Prevent False-Resistant Results and Improve Accuracy: A Multicenter Evaluation

Table 3

Summary of categorical MGIT PZA susceptibility test results stratified by possible outcome and inoculation method.

Inoculation
method
Susceptibility test result
ResistantSusceptible
Number/categoryPercent of total Number/categoryPercent of total
TrueFalseTrueFalseTrueFalseTrueFalse

BD526444.855.2186298.91.1
A421771.228.82261195.44.6
C42884.016.0230996.23.8

Percentages correspond to the positive predictive value of a resistant result being true-resistant. Percentages correspond to the negative predictive value of a susceptible result being true-susceptible. 18 of the false-susceptible results occurred in isolate 17. The remaining 4 occurred in isolate 14, all in the same laboratory.

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