Thirty cultures of 47:r:253 (Ar 23:24–25) were isolated over 7 months from the faeces of a captive reptile. All were unusual in their inability to produce a positive -nitrophenyl---galactosidase reaction, and in their ability to ferment sucrose. These carried a plasmid having a molecular mass of 72 megadaltons which specified tetracycline resistance and a plasmid of 5 megadaltons which coded for the ability to ferment sucrose. The small size of this sucrose plasmid clearly distinguishes it from others which have been reported.


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