POMC and viral infectious disease: When the patient suffers from acute viral infection, the adrenocorticotropic hormone will increase stress secretion, which promotes the body’s anti-infection, inhibit the inflammatory response, so in the early stage of eosinophils is reduced, but after entering the clinical intervention and treatment, the level of glucocorticoid hormone decreases, so that eosinophils gradually increase again in the recovery period of the disease (18, 19).