IFNG and influenza: It seems clear that the analyzed influenza-antigen stimulated cell-mediated immunity, both before challenge (Figure 7 and Figure 8) and after influenza challenge (Figure 10, Figure 11 and Figure 12), the later in old animals, the vaccine regimen containing adjuvants that enhance both humoral, virus-neutralizing, and binding antibodies in serum and respiratory mucosa, together with interferon-gamma secreted cell-mediated immunity seem to result in long-lasting protective immunity in both strains of mice, but perhaps more in out-bred than in inbred animals.