Increased number of eosinophils, increased concentrations of total immunoglobulin E (IgE), and increased levels of interleukin (IL)-4, IL-6, IL-5, IL-10, IL-13, and interferon-gamma (IFN-γ) were reported in peripheral blood of patients with systemic signs of Toxocara infection (3, 4). This evidence concerns the gene IFNG and toxocariasis.