IL4 and infection: Exploring cytokine response in the course of P. berghei infection, the relatively slower parasite proliferation in BALB/c mice during the second week of infection has been associated to markedly higher levels of the Th2 cytokines, namely IL4 from day 5 of infection and IL10 from day 7 onwards, indicating the onset of a Th2-orchestrated humoral response in this mouse strain [22].