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. 1990 Sep;58(9):3129–3134. doi: 10.1128/iai.58.9.3129-3134.1990

Role of the P plasmid in attenuation of Vibrio cholerae O1.

E J Bartowsky 1, S R Attridge 1, C J Thomas 1, G Mayrhofer 1, P A Manning 1
PMCID: PMC313621  PMID: 2387637

Abstract

The conjugative plasmid P of Vibrio cholerae has been shown to have a suppressive effect on the virulence of hypertoxigenic strains like 569B. In this study, we have sought to analyze this phenomenon. Utilizing the infant mouse cholera model, we have demonstrated that the presence of P increases the 50% lethal dose of V. cholerae classical Inaba 569B by more than 300-fold. No effect of P on cholera toxin (CT) production, whether measured by GM1 enzyme-linked immunosorbent assay, by CT activity in ligated rabbit ileal loops, or by transcription from the CT promoter, could be discerned. Colonization of the intestine by P+ derivatives was dramatically reduced although only a minor effect could also be demonstrated on in vitro attachment to intestinal strips. Electron microscopic examination suggested that the P plasmid was affecting the production of the TCP pilus. Another conjugative plasmid, V, has also been examined, but it had no effect on virulence.

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Selected References

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