IFNG and infection: The IFN mRNA levels were much higher at 48 h post infection than those at 12 h (for IFN-α P < 0.001; for IFN-β or IFN-γ P < 0.0001) as well as those at 24 h (for IFN-α P < 0.001; for IFN-β P < 0.05; for IFN-γ P < 0.0001).