The respective frequencies of CD8+ T cells expressing IFNγ at day 6 post infection (means±SD in NOD, BALB/c and C56BL/6 mice of 6.1±4.8%, 5.8±2.3% and 9.3±5.5%, respectively) did not differ (p>0.05; data not shown). Here, IFNG is linked to infection.