The majority of colostrum samples had IgA reactive to bacterial antigens, thus corroborating several studies that emphasize the importance of breast milk, which provides protection against infection by Haemophilus influenzae and Escherichia coli , (21) and enteric infections caused by E. coli , Vibrio cholerae , Campylobacter, Shigella spp and Giardia lamblia . This evidence concerns the gene CD79A and infection.