TABLE 2.

Lymphocyte blastogenesis responses to M. bovis PPD stimulation

Infection statusLymphocyte blastogenesis Δcpm (mean ± SE) ata:
PreinoculationDay 50 postinoculationDay 124 postinoculation
Noninfected33.3 ± 80 A−425 ± 812 A−284 ± 980 A
M. kansasii infected−127 ± 171 A4,676 ± 2,014 B9,123 ± 4,067 B
M. bovis infected52 ± 105 A17,836 ± 3,378 C48,741 ± 5,409 C
  • a Shown are mean (±standard error) lymphocyte blastogenic responses (Δcpm = M. bovis PPD stimulation − no stimulation) from noninfected (n = 10), M. kansasii-infected (n = 4), and M. bovis-infected (n = 9) cattle. The letters A through C indicate responses that differ (P < 0.05) for a specific time after inoculation (i.e., vertical comparisons). The same letter indicates that the responses did not differ.