IL5 and infection: Therefore, we compared L. sigmodontis infection in BALB/c WT mice with BALB/c mice lacking eosinophils (dblGATA) and BALB/c mice deficient in either IL-4R, IL-5 or both IL-4R/IL-5 during the peak of microfilaremia in WT mice (71 days post-infection, dpi) and a late time point of infection, where the infection is cleared in the majority of WT animals and IL-4R−/−/IL-5−/− started to show a decline in the peripheral blood MF counts (119 dpi).