CD79A and nutritional deficiency disease: Indeed, children with malnutrition exhibit an overabundance of pathogens, including Haemophilus, Campylobacter, and Escherichia/Shigella, belonging to Proteobacteria.81 This is associated with disordered IgA responses to GM, mainly an increase in IgA recognition of pathogens and a decrease in IgA recognition of commensals such as Verrucomicrobiaceae and Bacteroidaceae.