Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Maxillary Sinusitis by Staphylococcus aureus Infection in a Thoroughbred Gelding: Case Report

  • Lee, Sang Kyu (KRA Veterinary Center, Korea Racing Authority) ;
  • Lee, Inhyung (Department of Veterinary Clinical Sciences, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University)
  • Received : 2021.06.01
  • Accepted : 2021.09.28
  • Published : 2021.10.31
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Abstract

A 4-year-old gelding Thoroughbred racehorse, which had been undergoing antibiotic therapy at a local veterinary clinic, was referred to the KRA veterinary center with a 20-day history of continuous right nasal discharge. Patient's history, endoscopic examination, and radiographic examination revealed primary maxillary sinusitis. Under sedation, surgical intervention was performed to collect samples and remove the accumulated mucopurulent exudate in the sinus. Swab samples were collected from the sinus during surgery for cytology and antimicrobial susceptibility testing. Only one type of bacteria was cultured, and molecular analyses of 16S ribosomal RNA gene sequences identified it as Staphylococcus aureus (S. aureus). The isolate was resistant to multiple antibiotics, which are frequently used in equine practice. Trimethoprim-sulfamethoxazole was chosen based on antibiotic susceptibility test, trephination, and sinus lavage using saline were applied to treat bacterial sinusitis. The clinical signs improved after 1 month and the patient resumed training. This report describes S. aureus isolated from bacterial maxillary sinusitis in a horse and its antibiotic susceptibility.

Keywords

Acknowledgement

This study was supported by the Korea Racing Authority. The authors thank the KRA equine hospital staffs, Jihoon Jeong, Minhyun Lee, Kiyoung Jang, Youngjong Kim, Jeongwoo Choi, and Heonmin Park.

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