IL6 and infection: At 3 dpi, the levels of IFN-γ, IL-6, IL-10, MCP-1, and TNF-α in BALB/c mice infected with MA/12 (Fig. 5b–d,g,i) were considerably higher than in animals inoculated with PH/13 or BR/08; however, only the IL-10 elevation was significant (P < 0.05) relative to that observed with PH/13 infection (Fig. 5d).