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Instrumentation of Urinary Tract-Higgins MEDBRITLISOHNAL 29Three conclusions were drawn from this study: (1) That the risk of inducing bacteriuria at urological instrumentation under the conditions described is low; (2) that this risk is not reduced by giving a single dose of a long-acting wide spectrum antibiotic ; (3) that many cases of bacteriuria induced by instrumentation are self-limiting and therefore presumably of no serious consequence.A comparison of the results of this survey and of the results of other work in this field shows that conclusions regarding the risks of infection resulting from instrumentation in obstetric patients, or resulting from the presence of an indwelling catheter, cannot be applied to the risks of instrumentation in urological patients.