Resende et al. [6] demonstrated that in toxocariasis there is a mixture of Th2 and Th17 inflammatory responses, observed by the increase of cytokines IL-4, IL-5, IL-13, IL-33 and IL-17 in the serum of mice during larval migration, showing that T. canis larvae are capable of triggering the Th17 response. This evidence concerns the gene IL33 and toxocariasis.