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. 1980 Feb;27(2):632–637. doi: 10.1128/iai.27.2.632-637.1980

Antitoxic immunity to cholera in dogs immunized orally with cholera toxin.

N F Pierce, W C Cray Jr, P F Engel
PMCID: PMC550811  PMID: 7380543

Abstract

Colera toxin was evaluated as an oral immunogen against experimental canine cholera. Dogs were immunized orally with 100-microgram doses of purified cholera toxin or comparable doses of crude toxin. Both doses caused moderate diarrhea in most nonimmune dogs. Repeated oral doses (12 doses in 54 days) gave marked protection against the diarrheal effect of oral toxin, provoked a vigorous antitoxic response in jejunal mucosa, and gave nearly complete protection against subsequent oral challenge with living virulent Vibrio cholerae. Protection appeared to be due largely to the antitoxic response in intestinal mucosa. The effectiveness of cholera toxin as an oral vaccine contrasts with the previously described ineffectiveness of toxoid given orally. This study provides an example of mucosal immunity due to a nonreplicating vaccine given orally and suggests that cholera toxin may be useful as a component of an oral vaccine for cholera.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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