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Peer-reviewed veterinary case report

Septicemia and peritonitis due to Actinobacillus equuli infection in an adult horse.

Journal:
Veterinary pathology
Year:
2001
Authors:
Patterson-Kane, J C et al.
Affiliation:
Department of Pathology and Infectious Diseases · United Kingdom
Species:
horse

Plain-English summary

An 8-year-old Saddlebred mare was found to have a serious infection called septicemia and peritonitis, which was caused by a rare bacteria known as Actinobacillus equuli. The exact source of the infection was unclear, but it was suspected that small areas of damage in her colon, possibly from a medication called phenylbutazone, might have allowed the bacteria to enter her system. In other cases of this type of infection, horses have responded well to antibiotic treatment. Because this condition can be treated, it's important for veterinarians to recognize it in horses.

Abstract

Actinobacillus equuli is a rare cause of peritonitis in adult horses. Septicemia and peritonitis due to A. equuli were diagnosed at necropsy in an 8-year-old Saddlebred mare. The origin of the infection was not known; however, small necrotic colonic mucosal lesions presumed to have been caused by phenylbutazone treatment may have allowed bacterial invasion. A good response to antimicrobial treatment has been documented in the small numbers of previously reported acute cases of peritonitis. Because it is potentially treatable, it is important for pathologists and clinicians to identify horses with A. equuli peritonitis.

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Original publication: https://pubmed.ncbi.nlm.nih.gov/11280382/