FIG. 2.

TUNEL analysis of calves infected with the LR mutant. Thin sections were prepared from the TG of calves infected with the LR mutant. TUNEL assays were performed as described in Materials and Methods. Shown are a section from a mock-infected calf (A) and sections obtained 2 days (B), 4 days (C), 6 days (D), 10 days (E), and 14 days (F) after infection. These sections are representative of the results from many sections. The TG from two calves were examined for each time point. The arrows denote foci of TUNEL⁺ cells.