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. 2006 Mar;13(3):387–394. doi: 10.1128/CVI.13.3.387-394.2006

FIG. 1.

FIG. 1.

Longitudinal IFN-γ response to M. bovis PPD, M. avium PPD, or rESAT-6-CFP-10 fusion protein. Values represent the mean responses to each antigen (24-h stimulation) minus the response to medium alone ± standard error of the mean (error bars) for 10 M. bovis-inoculated calves (A) or 5 noninoculated control calves (B). Day 0 represents the day of inoculation. Arrows represent time points when purified protein derivative was injected for tuberculin skin testing. *, significantly different than the previous time point (P < 0.05). OD, optical density.