UTIs account for 30% of all nosocomial infections [NEJM 329: 1328, 1993], with catheterization being the most important predisposing factor (4 – 7% risk per day [Am J Med 92S4A: 114, 1992]). The key pathogenic event is loss of Lactobacillus protection. Diagnosis cannot be based on cultures alone because half of all patients with catheters […]