Pathogen antigens recognized by colostrum secretory IgA

Pathogen antigens recognized by colostrum secretory IgA (sIgA) represent a heterogeneous group of molecular structures from bacteria, viruses, and parasites that are targeted by the maternal immune system to protect the neonate. These antigens include critical virulence factors such as viral capsid proteins (e.g., from Rotavirus), bacterial fimbriae (e.g., from Escherichia coli), and various exotoxins (Hurley & Theil, 2011, Nutrients). In the gastrointestinal tract, sIgA provides passive immunity by binding these antigens, which prevents pathogens from adhering to and invading the intestinal mucosa—a process known as immune exclusion (Mantis et al., 2011, Mucosal Immunology). This interaction is vital for protecting infants during the period when their own adaptive immune system is immature. Therapeutically, these antigens are the targets of hyperimmune bovine colostrum (HBC) products, which are used to prevent or treat enteric infections and traveler's diarrhea (Ulrich et al., 2022, Frontiers in Immunology). Because this entry refers to a broad category of diverse molecules across multiple species rather than a single defined protein, it is considered a collective immunological target rather than a specific molecular target.

Other names

Colostrum-reactive pathogen antigenssIgA-targeted enteric antigensMaternal antibody targetsSecretory IgA-binding epitopes

Secretory IgA (sIgA) antibodies bind to specific pathogen antigens, such as surface adhesins, viral capsids, or toxins, to prevent their attachment to host epithelial cells (immune exclusion), neutralize biological activity, and facilitate agglutination for mechanical clearance from the gut (Mantis et al., 2011, Mucosal Immunology).