Table 1.

Percentages of TUNEL-positive bovine macrophages (apoptotic cells) infected with logarithmic- or stationary-phaseSalmonella serovar Typhimurium at 0, 20, 60, and 180 min after infection

Time (min)% of TUNEL-positive macrophages in the following samplesa:
Uninfected controlLogarithmic phaseStationary phase
0b 14.47 ± 15.42 x47.75 ± 34.45 Ay38.51 ± 39.49 xy
205.40 ± 6.20 x75.54 ± 28.34 ABy42.51 ± 28.88 z
606.65 ± 5.36 x81.32 ± 26.97 By35.57 ± 31.92 x
1802.78 ± 1.88 x93.41 ± 5.53 By71.22 ± 13.39 y
  • a Values are means and standard deviations from five independent experiments. Different uppercase letters in the same column indicate significant difference (P < 0.05). Different lowercase letters in the same row indicate significant difference (P < 0.05).

  • b Time zero corresponds to macrophages incubated for 30 min at 37°C after challenge with Salmonellaserovar Typhimurium (see Materials and Methods).