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Urinary tract infection

With a share of 30 to 40 per cent, urinary tract infection (UTI) is one of the most common nosocomial infections. Around 80 per cent of all UTIs are associated with transurethral catheters. The risk of developing an infection increases proportionally with the duration of catheterisation: each day, 3 to 10 per cent of all patients with transurethral catheters acquire a bacteriuria. Half of the patients with permanent catheters develop a bacteriuria within 7 days. The most common pathogens are Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus.

More than 90 per cent of the catheter-related UTIs are asymptomatic. A precondition for the surveillance of UTI is the differentiation between symptomatic UTI and asymptomatic bacteriuria following the definitions of the Centers for Disease Control and Prevention (CDC) and the Robert Koch-Institute (see box).

Urinary tract infection
CDC/RKI Definitions

D1 Symptomatic urinary tract infection must meet at least one of the following criteria:

D2 Asymptomatic bacteriuria must meet at least one of the following criteria:



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