Antimicrobial susceptibility patterns from urinary isolates obtained from cats (2013‐2020)

Author:

Koontz Caitlan W.1,Epstein Steven E.2ORCID,Westropp Jodi L.3ORCID

Affiliation:

1. William R. Pritchard Veterinary Medical Teaching Hospital, School of Veterinary Medicine University of California, Davis Davis California 95616 USA

2. Department of Veterinary Surgical and Radiological Sciences, School of Veterinary Medicine University of California, Davis Davis California 95616 USA

3. Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine University of California, Davis Davis California 956161 USA

Abstract

AbstractBackgroundBacterial urinary tract infections have been associated with comorbidities and increased antimicrobial resistance over time.ObjectiveTo identify bacterial species, antimicrobial susceptibility patterns and risk factors associated with antimicrobial resistance.AnimalsThree hundred sixty‐three positive urine cultures from 308 cats.MethodsBacterial species and antimicrobial susceptibility data from positive aerobic bacterial urine cultures from cats with growth of ≥103 colony forming units per milliliter (cfu/ml) were included. Medical records were reviewed, and bacteriuria was classified as sporadic bacterial cystitis, recurrent bacterial cystitis or subclinical bacteriuria (SBU). Multivariable logistic regression analysis was used to evaluate antimicrobial resistance risk factors.ResultsA total of 444 bacterial isolates from 363 bacteriuric episodes were identified. Escherichia coli (52%) and SBU (59%) were the most common organism and classification, respectively. When compared to other classifications of bacteriuria, Enterococcus spp. were more likely to be isolated from SBU episodes (P < .001), whereas E. coli was more likely to be isolated from sporadic bacterial cystitis episodes (P < .001). Recurrent bacterial cystitis was associated with an increased risk of antimicrobial resistance to amoxicillin/clavulanic acid (odds ratio [OR], 3.9; 95% confidence interval [CI], 1.3‐11.3). The percent susceptibilities of all bacterial isolates to commonly prescribed antimicrobials were amoxicillin/clavulanic acid (72%), cefazolin (49%), enrofloxacin (61%), and trimethoprim/sulfamethoxazole (75%). Multidrug resistance was highest for Enterococcus faecium isolates (65%).Conclusions and Clinical ImportanceNo antimicrobial achieved >90% susceptible designation to all bacteria isolated highlighting the importance of performing urine culture and susceptibility testing, particularly for cats with recurrent bacterial cystitis.

Publisher

Wiley

Subject

General Veterinary

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