CD200 and infection: BALB/c mice were challenged with 50 CFU (12.5 50% lethal dose [LD50]) B. pseudomallei (K96243) via the aerosol route (using the Biaera aerosol management platform) and treated at 1 day post-infection with CD200-Fc or IgG control via the intraperitoneal (i.p.)route.