FIG. 1.

Proliferative responses of BLN cells from five foals and five adult horses at 15 days after challenge with virulent R. equi. Five foals and five adult horses were used as uninfected controls. BLN cells were stimulated either with ConA (A) or with soluble R. equi antigens (B). The change in fluorescence was calculated as the mean fluorescence of the stimulated cells minus that of the same cells cultured without mitogen or antigen. The results are displayed as mean ± SD. Different letters between experimental groups (a, b) indicate a statistically significant difference (P < 0.05).