IL-4R-/-/IL-5-/- DKO supported the infection better than any other strain (70 days), followed by IL-5-/- KO (50 days), IFN-γ-/-/IL-5-/- DKO (40 days), IFN-γ-/- KO (20 days) and lastly IL-4R-/- KO (5 days). This evidence concerns the gene IL5 and infection.