Tibial osteomyelitis caused by Rhodococcus equi in a mature horse

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A 7-year-old Paint mare presented for evaluation of a swollen right hindlimb of approximately 6 weeks' duration. Ultrasonography and radiography suggested a severe osteomyelitis and abscessation of the right tibia. Previous treatment included systemic antimicrobial therapy using procaine penicillin G (22,000u/kg bwt, q. 12h, i.m.) and gentamicin sulfate (6.6mg/kg bwt, q. 24h, i.v.) initially followed by oral doxycycline (10mg/kg bwt, q. 12h, per os) and rifampin (5mg/kg bwt, q. 12h, per os). Based on the poor prognosis the mare was subjected to euthanasia. Necropsy results subsequently revealed a severe, chronic, focal, necrotising osteomyelitis with localised cellulitis and abscessation. Rhodococcus equi was isolated from the tibia, subcutaneous abscess and from a pectoral abscess found at necropsy. Immunological testing of blood samples obtained ante mortem revealed normal blood lymphocyte phenotyping, but markedly increased IgG and IgM concentrations, indicating an active humoural response. While there have been reports of Rhodococcus equi infection in mature horses this is an area previously unreported in the literature.

Original languageEnglish (US)
Pages (from-to)283-286
Number of pages4
JournalEquine Veterinary Education
Volume26
Issue number6
DOIs
StatePublished - 2014

Fingerprint

Rhodococcus equi
osteomyelitis
abscess
Osteomyelitis
tibia
Tibia
Abscess
Paint (horse breed)
mares
Horses
necropsy
Penicillin G Procaine
cellulitis
procaine
horses
Immunophenotyping
rifampicin
benzylpenicillin
doxycycline
Cellulitis

Keywords

  • Horse
  • Immunocompetence
  • Infectious
  • Orthopaedic
  • Rhodococcus

ASJC Scopus subject areas

  • Equine

Cite this

Tibial osteomyelitis caused by Rhodococcus equi in a mature horse. / Kilcoyne, Isabelle; Nieto, Jorge; Vaughan, Mary E.

In: Equine Veterinary Education, Vol. 26, No. 6, 2014, p. 283-286.

Research output: Contribution to journalArticle

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