Other examples of IgE cross-reactivity include pollen–food allergy, such as apple–birch allergy or pollen–fruit allergy (249–253), dog–cat allergy (254, 255), poultry–meat allergy (256), fish–chicken allergy (257), birch–oak allergy (258), latex–hymenoptera allergy (239–241). The gene discussed is IGHE; the disease is food allergy.