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. 1975 Oct;75(2):203–214. doi: 10.1017/s0022172400047239

Contribution to the study of live streptomycin-dependent Salmonella vaccines: the problem of reversion to a virulent form.

I R Vladoianu, F Dubini, A Bolloli
PMCID: PMC2130299  PMID: 1100711

Abstract

The recovery of virulence by means of reversion of a live streptomycin-dependent (Sm D) Salmonella typhimurium vaccine was studied in CD-1 Swiss mice. Initially, a one-step Sm D mutant was obtained from a virulent streptomycin-sensitive (Sm S) S. typhimurium strain. Afterwards, two pools of streptomycin-independent (Sm I) revertants were prepared from the Sm D strain. The virulence of the Sm D strain and of the Sm I revertants was tested intraperitoneally. In the virulence testing the original suspension of the Sm I revertants, as well as their 1st and 10th passages on plain medium, medium+50 mug. streptomycin/ml. and medium+1000 mug. streptomycin/ml. were used. The results show that the Sm D mutant was avirulent, its avirulence being due to an intrinsic, genetic quality. The Sm I revertants, compared to the original Sm S strain, also displayed a lack of virulence. However, afterwards, the Sm I revertants behaved quite differently, according to their subsequent passages. Indeed, there was an increase in virulence after passages on plain medium, whereas similar passages on medium containing the drug, the virulence not only failed to increase, but disappeared almost completely. Moreover, the passages on medium containing 1000 mug. streptomycin/ml. induced a return to the status of drug-dependence. The danger of recovery of virulence by means of revertants is evaluated.

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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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