Fig. 2. Expression of mRNA encoding (A) TLR-2, (B) TLR-3, (C) TLR-4, (D) TLR-7, (E) TLR-8, (F) RIG-I, and (G) MDA5 in peripheral blood mononuclear cells (PBMCs) collected from healthy cattle and PI cattle based on quantitative real-time PCR. Data presented are the means ± SEM (n = 6 per group). P < 0.05 is considered statistically significant.