Another constraint of serologic allergy diagnosis in patients with helminthiases is the presence of the carbohydrate epitope galactose-α1,3-galactose (α-Gal), which is expressed in non-primate mammalian proteins, such as the cat allergen Fel d 5 (cat IgA) and A. lumbricoides [104, 105]. This evidence concerns the gene CD79A and helminthiasis.