<p>mDC generated from wild type, (A and B) IRF-1<sup>−/−</sup>, IRF-8<sup>−/−</sup>, (C and D) IFN-α/βR<sup>−/−</sup>, or (E and F) IRF-5<sup>−/−</sup> mice were infected at an MOI of 0.1 and levels of IFN-α (A, C, and E) and IFN-β (B, D, and F) mRNA were measured by qRT-PCR. Values are an average of triplicate samples generated from three independent experiments. Asterisks indicate values that are statistically significant (***, P<0.0001, **, P<0.005, *, P<0.05) compared to wild type.</p