CD79A and infection: Recently, Schwarz et al. (60) demonstrated that naturally acquired C. suis-specific antibodies (IgA, IgM, and IgG) were transferred from sows to their piglets via colostrum, which in turn provided partial protection against the outcome of experimental infection (clinical disease and oocyst shedding) in the presence of high IgA titers in colostrum as well as milk and serum of superinfected sows.