CD79A and infection: Likewise, fecal IgA, the abundant class of antibodies in the intestinal secretion, serves as the first line of defense against infection (Michetti et al., 1992; Mantis et al., 2011; Gutzeit et al., 2014), and IgA antibodies against a variety of Salmonella antigens are highly effective in preventing salmonellosis (Michetti et al., 1992, 1994; Amarasinghe et al., 2013).