FIG. 2.

Binding of MAb 9d8(2a) to whole-cell M. tuberculosis Erdman and CDC 1551 at various culture times. M. tuberculosis Erdman (A and B) and CDC 1551 (C and D) were grown in the absence (A and C) or the presence (B and D) of Tween for periods of 11, 20, or 25 days before harvest. Each value represents the average of three measurements. Error bars show the standard deviations of the means. These growth experiments and the ELISA were repeated twice with similar results. O.D., optical density; MTB, M. tuberculosis; Alk-Phos; alkaline phosphatase.