1887

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Volume 5, Issue 4

The Effect On Virulence Of Transferring R Factors To Free

Abstract

SUMMARY

Different R factors were transferred from R  to two strains of in the alimentary tractof chicks. The virulence of the R  strains was then compared with the R strains from which they were derived by giving them orally to groups of 1-day-old chicks.

The mortality rates from infection with the R strains were similar to, slightly lower than, or much lower than those from infection with the corresponding R strains.

Virulence tests on strains from which R factors had been eliminated, and on strains to which R factors had been transferred at a high rate , suggested that the very possession of R factors was responsible for the smaller reductions in mortality rate observed with some of the R strains; but the other strains with which greatly reduced mortality rates were observed may have been low-virulence variants of the R parent strain that had subsequently acquired R factors from the R .

  • Received:
  • Accepted:
  • Published Online:
© J. MED. MICROBIOL. 1972
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1972-11-01
2024-04-26
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The Effect On Virulence Of Transferring R Factors To Salmonella Typhimurium In Vivo
J. Med. Microbiol. 5, 451 (1972); https://doi.org/10.1099/00222615-5-4-451
/content/journal/jmm/10.1099/00222615-5-4-451
/content/journal/jmm/10.1099/00222615-5-4-451
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