Secretion of antibodies in breast milk from naturally immunized mothers can provide protection against enteric and other diseases in children [11] . For example, elevated concentrations of antibodies specific for enteric pathogens, such as Vibrio cholerae, in the mother's breast milk do not prevent colonization with the bacterium in the nursing child, but do seem to protect the infected child from developing diarrhea [36] . Breast feeding is associated with a reduced incidence of Campylobacter diarrhea in young children compared with children that do not breast feed [37] . In those children that are breast fed and do develop diarrhea, the human milk consumed may not contain IgA antibodies specific for the common antigen of Campylobacter [37] , suggesting a degree of antigen specificity contained in the breast milk.