The MLN cells from Se-adequate mice secreted significantly higher levels of IFN-γ (>1900 pg/ml) (Figure 5A) during the early period of infection (7 or 14 days) (P<0.01) and their levels decreased (500–1000 pg/ml) as the mice started recovering from the infection (21 days) (Figure 5A). This evidence concerns the gene IFNG and infection.