IL5 and Increased total eosinophil count: The role of eosinophils and IL-5 remains unclear, with some reports suggesting eosinophilia is critical for parasite clearance (Shin et al., 1997; Daly et al., 1999; Knott et al., 2007) and others finding that IL-5 deficiency did not affect infectivity (Harvie et al., 2010).