FIG. 2.

CD4⁺ and CD8⁺ T cells from B. burgdorferi-infected mice produce IFN-γ after in vitro restimulation. CD4⁺ and CD8⁺ T cells were purified by negative selection from regional lymph nodes from infected C3H or B6 mice at the indicated day of infection. Bars represent the mean units of IFN-γ present per milliliter of supernatant of pooled CD4⁺ or CD8⁺ T cells stimulated with B. burgdorferi sonicate as determined by ELISA ± the standard error of the mean. Results are representative of three experiments.