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Urinary tract infections
1College of Physicians and Surgeons, Columbia University, New York, New York 10032.
Insights
Urinary tract infections (UTIs) affect various populations, with host factors like genetics playing a key role. Understanding risk factors and diagnostic criteria is crucial for effective UTI treatment.
Area of Science:
- Urology
- Infectious Diseases
- Genetics
Background:
- Urinary tract infections (UTIs) present a significant health concern across diverse age groups, from newborns to the elderly.
- Risk factors for lower UTIs in women include sexual activity, contraceptive choices, and voiding habits, with host factors often outweighing bacterial virulence.
Purpose of the Study:
- To review current understanding of UTI risk factors, diagnostic criteria, and treatment strategies.
- To highlight the importance of host factors, including genetic predispositions, in UTI development.
Main Methods:
- Literature review of populations at risk, contributing factors, and diagnostic evolution.
- Analysis of diagnostic thresholds (e.g., 10(2) CFU/mL) and the significance of leukocytes in urine.
- Examination of treatment guidelines for uncomplicated and complicated UTIs.
Main Results:
- Host genetic factors like secretor status and P blood group phenotype are significant contributors to UTI susceptibility.
- Diagnostic criteria, including bacterial concentration and leukocyte presence, have evolved.
- Treatment duration varies significantly between uncomplicated (3-5 days for most) and complicated UTIs (7-14 days).
Conclusions:
- Host factors, particularly genetic ones, are paramount in UTI pathogenesis.
- Accurate diagnosis and tailored treatment duration based on UTI complexity are essential for successful outcomes.
- Complicated UTIs require longer treatment courses, influenced by underlying abnormalities and causative organisms.
Abstract:
The populations at risk for urinary tract infection include the newborn, particularly the premature, prepubertal girls, young boys, sexually active young women, elderly males, and elderly females. Risk factors that contribute to lower tract infection in women include sexual intercourse, diaphragm-spermicide use, and voiding behavior. Host factors, more than bacterial virulence, are probably the most important contributors to infection. The genetic factors that are important contributors are secretor status and P blood group phenotype. Which patients to culture, when to culture, and the number of organisms required to define infection have changed in the past decade. A concentration of 10(2) colony forming units/mL can cause an acute urinary tract infection in the healthy woman. The presence of leukocytes in the urine is of increasing diagnostic importance. Complicated urinary tract infections occur in neonates with such congenital anomalies of the urinary tract as urethral valves or in patients with neurologic disease resulting in urinary stasis. In older men or women, complicated urinary tract infections occur with obstruction, instrumentation, surgery, anatomic abnormalities, or stones. Single-dose therapy of uncomplicated urinary tract infection is useful in only a small subset of patients, specifically in patients less than 45 years of age who have short duration of symptoms. The majority of patients with uncomplicated infections should receive treatment for 3-5 days. Response to therapy and long-term cure rates in complicated urinary tract infection are related both to the type of underlying abnormality and to the species of the infecting organism. Complicated urinary tract infections should be treated for 7-14 days.