Abstract
Six IncP plasmids were tested for their ability to generate tellurite-resistant variants by plating bacterial strains harbouring them on medium containing potassium tellurite. Four plasmids, three of subgroup IncP.alpha. and one not allocated, formed variants that could transfer tellurite-resistance at the same frequency as plasmid-determined drug resistance. This property was not shared by two examples of subgroup IncP.beta.

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