Abstract
An investigation of strains of Proteus morganii isolated from patients in Odense, Denmark, and of 21 serotype strains revealed a close correlation between the fermentation of trehalose and a non‐transmissible resistance to tetracycline. The trehalose fermenting, tetracycline resistant strains had a longer flagellar wavelength than the non‐fermenting, sensitive strains. Resistance to chloramphenicol occurred only in strains of the former group.

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