Fig. 2

Body temperature and NKT cell frequencies. a Change in body temperature during the challenge period was based on the average of the -1 and 0 d.p.i. body temperatures. b NKT cells as a proportion of peripheral blood CD3⁺ lymphocytes at 0 and 20 d.p.v. and 5 d.p.i.. c NKT cells as a proportion of CD3⁺ lymphocytes in BALF, lung tissue, and TBLN at 5 d.p.i.. Differences between treatment groups were determined by Tukey’s multiple comparisons test. A statistically significant difference between two groups is indicated by a star (a) or different letters (b, c). Data are represented as mean ± SEM. Symbols represent treatment groups (a) or individual pigs (b, c)