The γδ T cell subsets from the VirHRV-infected pigs were detected as shown in Fig. 1. The y-axis is the mean frequencies (%) of each of three subsets among total γδ T cells. The error bars represent standard error of the mean. The capital letters A, B, and C indicate the results of significance testing for differences among PID 0, 3 and 5. Unshared letters indicate significant difference among PID 0, 3 and 5 on frequencies of the three subsets (Kruskal–Wallis rank sum test, p < 0.05, n=7–8), while shared letters indicate no significant difference.