Whilst interleukin 4 (IL4) production by T helper 2 (Th2) T cells can support antibody production by B cells, IFNγ production by γδ T cells and T helper 1 (Th1) CD4+ T cells has been suggested to also play a role in mediating blood-stage protection in rodent malaria models [6]. Here, IL4 is linked to malaria.