In the absence of symptoms, screening for bacteriuria should be avoided in subjects with an indwelling bladder catheter. In case of asymptomatic bacteriuria (absence of systemic or local symptoms) in elderly patients with cognitive impairment, delirium or a history of falls, careful monitoring is indicated and clinical evaluation and scrupulous observation are needed rather than the immediate introduction of antibiotic therapy. Screening and treating an asymptomatic bacteriuria is allowed only in urological procedures at risk of mucosal bleeding. There are no current recommendations on patients with high-risk neutropenia (neutrophil count<100 cells/mm3, duration ≥7 days) and on high risk patients as diabetics, those living in residential facilities and those who had a bladder catheter for less than thirty days.

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