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. 1994 Apr;62(4):1480–1483. doi: 10.1128/iai.62.4.1480-1483.1994

Potential for reacquisition of cholera enterotoxin genes by attenuated Vibrio cholerae vaccine strain CVD 103-HgR.

J B Kaper 1, J Michalski 1, J M Ketley 1, M M Levine 1
PMCID: PMC186308  PMID: 8132356

Abstract

The potential for reacquisition of ctxA genes by attenuated Vibrio cholerae O1 vaccine strain CVD 103-HgR was examined by performing a series of mating experiments under a variety of in vivo and in vitro conditions. We found no evidence that CVD 103-HgR could reacquire ctxA genes from wild-type V. cholerae O1 strains. However, if the donor V. cholerae O1 strains were genetically manipulated to add genes that allow chromosomal gene transfer, then ctxA sequences could be acquired by CVD 103-HgR. The minimal excretion of CVD 103-HgR by vaccinees and the refractoriness to reacquisition of ctxA sequences suggest that this well-tolerated, highly immunogenic live oral cholera vaccine will have a minimal environmental impact.

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Selected References

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