CD79A and infection: In particular, research is needed to determine whether the detection of serum IgA, i.e., an antibody isotype necessarily produced by the piglet in response to infection, could be used to identify infection in the face of PEDV-specific colostral (IgG) antibody or whether serum IgA response could be used  in a confirmatory assay to clarify equivocal PEDV WV IgG ELISA results.