Perhaps it is due to a unique response to viral infection by these individuals’ T-cells and eosinophil proliferation signaling; hypothetically, eosinophilia could be explained by these individuals’ recruitment of CD4 T-cells and subsequent production of interleukin 5(IL 5), an “eosinophil colony-stimulating factor” [22]. The gene discussed is CD4; the disease is Increased total eosinophil count.