Figure 4.

Exacerbation of infection in T-cell receptor (TCR)-β^–/– mice by anti-interferon-γ (IFN-γ) treatment. Results are expressed as mean ± SE from groups of five or six individually housed animals; the bar annotated ‘a’ was significantly different (P < 0·05) from the bars annotated with ‘b’. Mice were injected intravenously with 50 µg of rat anti-IFN-γ or rat immunoglobulin G (IgG) as indicated, and infected with sporulated oocysts 3 hr later.