IgA antibody plays an essential role in mucosal immunity and binds with immunogens/pathogens to restrict them from entering the mucosal membrane. Anti-mouse IgA (α-chain specific)-peroxidase antibody can be used for determining the secretory IgA (sIgA) in intestinal fluid. It can also be used in direct ELISA. Goat anti-mouse IgA (α-chain specific)-peroxidase antibody reacts specifically with mouse IgA.