Thus, Bjustrom-Kraft et al. (2016) found that a porcine epidemic diarrhea virus (PEDV) oral fluid ELISA based on IgA detection provided the best diagnostic performance [41] and Rotolo et al. (2018a) demonstrated that an IgM-IgA PRRSV oral fluid ELISA detected infection in young pigs, even in the presence of circulating maternal IgG PRRSV antibody [40] (Fig. 1). The gene discussed is CD79A; the disease is infection.