Article Text
Abstract
Co-trimoxazole was found to have a predominantly bacteriostatic effect upon 28 urinary isolates of Enterobacteriaceae in nutrient broth and was never bactericidal in artificially infected urine. The components of co-trimoxazole were tested individually and trimethoprim was found to be at least as effective as co-trimoxazole in nutrient broth and in urine. Trimethoprim alone produced some bactericidal effect in urine but this was antagonized by sulphamethoxazole.
Laboratory tests for evaluating these drugs may give a misleading impression of their activity in vivo. Further clinical comparisons should therefore be made between trimethoprim and cotrimoxazole to determine when trimethoprim should be used in preference to the combination.
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↵1 Present address: The Group Pathology Laboratories, The County Hospital, York, YO3 7PG.
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