CSF2 and Increased total eosinophil count: CD4+ T lymphocytes release IL-5, a key cytokine that attracts eosinophils to the inflammatory tissue sites and also contributes to increased blood eosinophilia in association with granulocyte-macrophage colony-stimulating factor (GM-CSF) under a Th2 environment [4,9,27,67,68,69].