Fig. 2

Immunohistochemical detection of T and B lymphocytes in caecum of 22-days-old birds. Immunohistochemical detection of CD4+ (a, b), CD8β+ (c, d) and Bu1+ (e, f) lymphocytes in caecal lamina propria of birds, which had been inoculated with either C. jejuni or C. jejuni-free medium at 22 day post hatch (Experiment 2). Broiler-type (BT) (a, c, e) and layer-type (LT) (b, d, f) birds, which were fed with either broiler feed (bf) or layer feed (lf). Asterisk letters indicate significant differences between C. jejuni-inoculated (C. jejuni) and C. jejuni-free control (con) groups at the indicated days post C. jejuni inoculation (n = 6/group, p < 0.05)