CD4+ T cell population from HLN of uninfected and infected sheep. Percentage of CD4+ T cell from HLN in uninfected and infected animals after 20 000 events, by flow cytometry. Each column represents mean values, bars show standard error. Mann–Whitney U-test was used to compare data from infected animals to uninfected animals. Statistical differences are represented by asterisks (***P = 0.0002).