Equine

Research Abstract

E02 - Urinary Tract Infections: Retrospective Study in an Equine Hospital between 1995 to 2016

Thursday, June 14
10:30 AM - 10:45 AM
Location: WSCC 620

URINARY TRACT INFECTIONS: RETROSPECTIVE STUDY IN AN EQUINE HOSPITAL BETWEEN 1995 AND 2016. T. Lemirre and D. Jean. Département de Sciences cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, St-Hyacinthe, Canada. 


Urinary tract infections (UTI) are uncommon in horses and data are limited in equine patients. Escherichia coli are reported to be the most frequently isolated bacteria but several other bacteria can be identified. The goal of our retrospective study is to describe clinical signs, identify pathogens and quantify microbial sensitivity profiles.


Clinical records from cases presented to an equine hospital between 1995 and 2016 were rewieved.  Cases were included if a bacteriuria was identified with a threshold of unit forming colonies in cultures based on a previous study from MacLeay and Kohn (1998).


Twenty-eight cases were identified. Prevalence of UTI in our equine cases was 0.13% between 2009 and 2016. Trakehner and Holsteiner horses were significantly overrepresented compared to the hospital population (p < 0.05) and UTI were more frequent in females (p < 0.05). Urinary tract infections were associated with other diagnostics involving the urinary tract such as bladder emptying problems in 64% of the cases. Eighty-four bacteria were isolated from 54 cultures. Escherichia coli and Enterococcus spp. were the most common bacteria representing respectively 31% and 29% of isolated bacteria. Trimethoprim-sulfonamide, enrofloxacin and ceftiofur were the most commonly used antibiotics, especially at the beginning of hospitalization, and respectively 22%, 39% and 42% of isolated bacteria were sensible to these drugs. Seventy percent of isolated bacteria were multi-drug resistant. These results have to be placed in a context where two equine patients represented 31% of the isolated bacteria. Evaluation of the response to treatment was limited by the study design.


In conclusion, UTI is uncommon in horses and we identified a breed and sex predisposition. Both gram positive and negative bacteria were identified, and a high prevalence of multi-drug resistant bacteria can represent a therapeutic challenge in horses with urinary tract infections in an hospital setting.

Daniel Jean, DACVIM

Professor in Equine Internal Medicine
University of Montreal

I'm a professor in Equine Internal Medicine at the clinical department of Veterinary Medicine faculty of Université de Montreal since 2001. My clinical interest are the pulmonary and cardiac diseases in horses.

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