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Background  Urinary tract infections (UTIs) are among the most common infections worldwide. With continuing trends of antibiotic resistance, the etiological distribution and antibiotic susceptibility surveillance are of great importance for empirical antimicrobial therapy. The risk factors and clinical circumstances of UTI among different age categories varied; thus, the pathogens and antimicrobial susceptibilities of UTI may also change with age. The aim of this study was to compare the etiological profiles and antibiotic resistance patterns of UTIs sorted by different age categories from a tertiary general hospital during a 12-year period.    Methods  All positive urine culture results from non-repetitive UTI patients in our hospital from January 2009 to December 2020 were collected retrospectively. The microbial distribution and antibiotic resistance rates were analyzed by WHONET 5.6 software. The etiological profiles sorted by different age categories (newborn, pediatric, adult, and geriatric) and antibiotic resistance rates of the top five pathogens were analyzed.    Results  A total of 13,308 non-repetitive UTI patients were included in our study.  Enterococcus faecium  was dominant in newborn (45%,  n  = 105), and replaced by  Escherichia coli  in pediatric (34%,  n  = 362), adult (43%,  n  = 3,416), and geriatric (40%,  n  = 1,617), respectively. The etiological profiles of different age categories were divergent, sorted by genders (male and female) and ward types (outpatient, inpatient, ICU, and emergency).  E. coli ,  Klebsiella pneumoniae ,  Enterococcus faecalis ,  E. faecium , and  Pseudomonas aeruginosa  were the top five pathogens in all age categories. The resistance rates of cefoperazone–sulbactam and piperacillin–tazobactam in  E. coli  were low in all age categories. The resistance rates of other cephalosporins, carbapenems, and fluoroqinolones in  K. pneumoniae  were higher in geriatric patients overall.  E. faecium  was more resistant than  E. faecalis  in all age categories. Multidrug resistance increased with age, which was more serious in geriatric patients.    Conclusion  The UTI etiological profiles and antibiotic resistance patterns varied among different age categories, especially in pediatric and geriatric patients; thus, a different antibiotic therapy for various age categories should be considered when initiating empirical antimicrobial therapies.

frontiers in microbiology

Urinary Tract Infection Etiological Profiles and Antibiotic Resistance Patterns Varied Among Different Age Categories: A Retrospective Study From a Tertiary General Hospital During a 12-Year Period