IL4 and infection: Together, the use of IL-4 reporter mice (BALB/c and C57BL/6 4get mice) revealed an increase in eosinophils (i.e., SiglecF+CD45+SSC-Ahigh cells), which reached up to 3.5 × 104 cells per ear in C57BL/6 and 6 × 103 cells per ear in BALB/c mice at d6 after infection.