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Abstract

S. typhi strains harboring R plasmids are a common finding in Mexico City hospitals. The predominant R plasmids share the following properties: they belong to the same incompatibility group (H1)’ have a molecular weight of 135 Mdal, carry a temperature sensitive transfer system, and code for the resistance to Cm, Sm, Su, Hg and Tc. The general organization of the resistance genes resembles that of RlOO, since homogenic derivatives which have lost the r-determinants, Tn1O or all the resistance genes can be isolated in vitro by several methods. Furthermore, naturally occurring a-plasmids deleted for the r-determinants or Tn1O have been found, although at low frequency. Complementation experiments indicated that the ts transfer system of the mexican plasmids is not related to that of Flac, Rl-19 or Col Ibdrd.

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© 1981 Springer Science+Business Media New York

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Alfaro, G. et al. (1981). Brief Reports on All Topics. In: Levy, S.B., Clowes, R.C., Koenig, E.L. (eds) Molecular Biology, Pathogenicity, and Ecology of Bacterial Plasmids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3983-0_56

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  • DOI: https://doi.org/10.1007/978-1-4684-3983-0_56

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-3985-4

  • Online ISBN: 978-1-4684-3983-0

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