SERPINA1 and gastroenteritis: Numerous biomarkers of EED measured in urine, blood, and stool have been proposed [11], including alpha-1-Antitrypsin (AAT) reflecting increased intestinal permeability and protein loss [12,13], calprotectin (CP) and myeloperoxidase (MPO) both reflective of the presence of intestinal inflammation [4,7,13,14].