CD4 and infection: The Th2 CD4+ T cells expressing IL-4 and Treg cells expressing CD4+CD25+Foxp3+ and CD4+CD25–Foxp3+ were significantly induced at the early intestinal stage (6 days post-infection, day 6, Figure S1) and NBL migration stage (day 15, Figure S1) compared to the those of uninfected mice.