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. 1987 Apr;55(4):892–898. doi: 10.1128/iai.55.4.892-898.1987

Salmonella typhi 205aTy, a strain with two attenuating auxotrophic characters, for use in laboratory teaching.

R F Brown, B A Stocker
PMCID: PMC260435  PMID: 3493975

Abstract

The need for p-aminobenzoic acid of a previously reported pab mutant in a Salmonella typhi strain causes loss of virulence (mouse median lethal dose by the intraperitoneal route with mucin, ca. 10(7) CFU, versus less than 200 CFU for related pab+ strains). This strain, however, gave p-aminobenzoic acid-independent revertants at a low frequency (ca. 4 X 10(-10) per bacterium per generation). It was therefore given, by transduction and mutation, a transposon-generated, nonreverting (rate, less than 3 X 10(-11) per bacterium per generation) mutation at purA, causing a requirement for adenine; such a mutation in a wild-type strain caused about the same loss of virulence as the pab mutation. The pab purA strain, 205aTy, has mouse median lethal dose of ca. 5 X 10(7) and is expected to be unable to cause typhoid fever. Since strain 205aTy behaves like a typical Vi-positive S. typhi strain in nearly all common tests, we propose that it is a safe strain for use in laboratory teaching, proficiency testing, and the like.

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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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