IL4 and infection: Importantly, stimulation of harvested MLN cells with 20μg/ml α-CD3 revealed that production of Th2 cytokines (IL-4, IL-5, IL-13 and IL- 10) peaked from day 6 (S1 Fig) to day 7 post-infection and diminished at day 9 and 12 post-infection (Fig 1D–1G).