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. 1978 Oct;22(1):181–188. doi: 10.1128/iai.22.1.181-188.1978

Isolation and phenotypic characterization of virulence-deficient mutants of Vibrio cholerae.

V S Baselski, S Upchurch, C D Parker
PMCID: PMC422134  PMID: 730346

Abstract

Mutants of Vibrio cholerae was isolated on the basis of reduced ability to induce diarrhea in orally challenged infant mice. Nitrosoguanidine-treated clones were screened for low fluid accumulation ratios in individual mice, and presumptive mutants were confirmed in additional mouse tests. Mutants were examined for alterations in phage type, motility, toxin production, proteolytic activity, neuraminidase production, amylase production, morphology, growth requirements, carbohydrate fermentations, in vitro growth patterns, and cell surface alterations. The types of mutants found included several with previously recognized virulence-associated markers (rough, nonmotile, toxin deficient, protease deficient); several types with pleiotropic alterations (cell morphology, decreased extracellular products); and several with no previously recognized virulence-deficient phenotype (purine requiring, cell surface altered, rapid death in vitro, no defect found). Dose-response kinetics showed that most mutants could provoke diarrhea if given in 100-fold greater numbers than the dose used for screening. Recovery of viable organisms from the gut late in infection showed reduction of survival and/or multiplication capacity for the mutants, with variation in the degree of reduction for the different classes.

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Selected References

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