IFNG and infection: Although WT mice treated with control IgG had no parasites and limited neutrophilia evident in cytospins prepared from peritoneal exudate cells at 7 days post-infection (Fig. S3a), WT mice depleted of IFN-γ had abundant parasites and high neutrophil numbers evident (Fig. S3b), and acute mortality occurred at 8 dpi (data not shown).