Diagnostic approaches, aetiological agents and their associations with short-term survival and laminitis in horses with acute diarrhoea admitted to referral institutions

Gomez, DE; Arroyo, LG; Schoster, A; Renaud, DL; Kopper, JJ; Dunkel, B; Byrne, D; Toribio, RE

Abstract

Background: An international description of the diagnostic approaches used in different institutions to diagnose acute equine diarrhoea and the pathogens detected is lacking.Objectives: To describe the diagnostic approach, aetiological agents, outcome, and development of laminitis for diarrhoeic horses worldwide.Study designMulticentre retrospective case series.Methods: Information from horses with acute diarrhoea presenting to participating institutions between 2016 and 2020, including diagnostic approaches, pathogens detected and their associations with outcomes, were compared between institutions or geographic regions.Results: One thousand four hundred and thirty-eight horses from 26 participating institutions from 4 continents were included. Overall, aetiological testing was limited (44% for Salmonella spp., 42% for Neorickettsia risticii [only North America], 40% for Clostridiodes difficile, and 29% for ECoV); however, 13% (81/633) of horses tested positive for Salmonella, 13% (35/262) for N. risticii, 9% (37/422) for ECoV, and 5% (27/578) for C. difficile. C. difficile positive cases had greater odds of non-survival than horses negative for C. difficile (OR: 2.69, 95%CI: 1.23-5.91). In addition, horses that were positive for N. risticii had greater odds of developing laminitis than negative horses (OR: 2.76, 95%CI: 1.12-6.81; p = 0.029).Main limitations: Due to the study's retrospective nature, there are missing data.Conclusions: This study highlighted limited diagnostic investigations in cases of acute equine diarrhoea. Detection rates of pathogens are similar to previous reports. Non-survival and development of laminitis are related to certain detected pathogens.

Citation

Gomez, D., Arroyo, L., Schoster, A., Renaud, D., Kopper, J., Dunkel, B., Byrne, D., & Toribio, R. (2023). Diagnostic approaches, aetiological agents and their associations with short-term survival and laminitis in horses with acute diarrhoea admitted to referral institutions. Equine Veterinary Journal, https://doi.org/10.1111/evj.14024

• Journal Article Type: Article
• Acceptance Date: Oct 2, 2023
• Online Publication Date: Nov 20, 2023
• Publication Date: 2023
• Deposit Date: Dec 19, 2023
• Publicly Available Date: Dec 19, 2023
• Journal: Equine Veterinary Journal
• Print ISSN: 0425-1644
• Electronic ISSN: 2042-3306
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1111/evj.14024
• Keywords: antimicrobial associated diarrhoea; Clostridiosis; horse; Potomac horse fever; sand diarrhoea; DIFFICILE-ASSOCIATED DIARRHEA; EQUINE CORONAVIRUS INFECTION; FLUORESCENT-ANTIBODY TEST; CLOSTRIDIUM-DIFFICILE; EHRLICHIA-RISTICII; CLINICAL PRESENTATION; ACUTE COLITIS; ADULT HORSES; RISK-FACTORS; LARGE COLON