IL4 and infection: Similar to our observations in lymph node cultures, five weeks post-infection, the ears of LTCP393(R)-inoculated mice expressed higher levels of IL-4 mRNA than those of LTCP15171(S)-inoculated mice (372.6±168.1 and 43.51±20.81; p = 0.0398) (Fig. 5B), and no significant differences were found in the expression of IFN-γ mRNA (Fig. 5A).