Food allergies are caused by severe hypersensitivity to specific food allergens such as the egg protein ovalbumin. It is therefore important to test food products for the presence of allergens to protect allergic people from accidental ingestion. For egg detection. ELISA is the only reasonable commercially available test format. https://www.roneverhart.com/Madelaine-Silver-Foiled-Milk-Chocolate-Hearts-5LB-Bag/