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An experimental vaccine for enterotoxigenic Escherichia coli (ETEC) composed of a live, attenuated Salmonella vector-expressing enterotoxigenic E. coli fimbriae, colonization factor Ag I (CFA/I), stimulated a biphasic Th cell response when given orally and suppressed the normally produced proinflammatory response. Such suppression was also evident upon the Salmonella-CFA/I infection of macrophages resulting in diminished TNF-alpha, IL-1, and IL-6 production and suggesting that the CFA/I fimbrial expression by Salmonella may protect against a proinflammatory disease. To test this hypothesis, SJL/J mice were vaccinated with Salmonella-CFA/I construct 1 or 4 wk before induction of experimental autoimmune encephalomyelitis using an encephalitogenic proteolipid protein peptide, PLP(139-151). Mice receiving Salmonella-CFA/I vaccine recovered completely from mild acute clinical disease and showed only mild inflammatory infiltrates in the spinal cord white and gray matter. This protective effect was accompanied by a loss of encephalitogenic IFN-gamma-secreting Th cells and was replaced with an increase in IL-4, IL-10, and IL-13 secretion. Collectively, these data suggested that Salmonella-CFA/I is an anti-inflammatory vaccine that down-regulates proinflammatory cells and confers protection against a proinflammatory disease, experimental autoimmune encephalomyelitis, via immune deviation.

A Live Diarrheal Vaccine Imprints a Th2 Cell Bias and Acts as an Anti-Inflammatory Vaccine