FIG. 2.

Inverse relationship between TTP (black circles; in duplicate) in MGIT and colony count (white triangles; in triplicate) of 10-fold serial dilutions of cultured stock of M. tuberculosis H37Rv. Lines indicate linear regressions. Six colony count data points were censored due to lack of growth, whereas only one corresponding MGIT culture data point was censored. All negative cultures occurred at small inoculum volumes. Log mean TTP and log mean CFU were highly correlated (R = −0.970, P = 0.006).