Febrile urinary infections account for 5% of unexplained causes of fever in children up to 2 years of age. Urinary samples are therefore very common in pediatric emergencies. In children who have not acquired cleanliness, the most used method of collection is the placement of a sterile urine bag on the perineum. It allows a noninvasive urinary collection. However from a bacteriological point of view this method is debatable because the rate of contamination of the collections is important. This mode of collection is of interest only to exclude a urinary infection, by the realization of a urinary strip.