IL4 and infection: In contrast, five weeks post-infection, lymph node cells isolated from animals inoculated with LTCP393(R) and challenged with live parasites produced significantly higher levels of IL-4 (3.987±0.1914 ng/ml) than those isolated from animals inoculated with LTCP15171(S) (0.2122±0.0924 ng/ml; p<0.0001).