CONTEXT: France is still one of the biggest consumers of antibiotics in Europe. An explanation for this increase in consumption would be aging. Thus, part of this aging population lives in nursing home, where the urinary tract infection is the second most suspected pathology. However, it can most often be bacteriuria requiring no antibiotic therapy. In nursing home, nurses alert prescribers when an infection is suspected by describing clinical signs. However, their propensity to perform too rapidly and systematically an examination with dipsticks leads physicians to prescribe antibiotic. This is how a program called ATOUM is set up to reduce the prescription of antibiotics in nursing home. The present ATOUM 4 study builds on this program.