TNF and infection: The correlation coefficients (R2) for TNF-α, IL-1β, IL-6 and IL-12 with percent apoptosis were 0.906, 0.864, 0.879 and 0.890 respectively (P<0.05) on 5th day and 0.830, 0.669, 0.639 and 0.846 respectively (P<0.05) on 6th day of infection.