Acute recumbency associated with Anaplasma phagocytophilum infection in a horse

Rose D. Nolen-Walston, Sarah M. D'oench, Lisa M. Hanelt, Leslie C. Sharkey, Mary Rose Paradis

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

An 11-year-old Hanoverian-cross gelding was evaluated because of acute onset of ataxia, recumbency, and fever. At the stable, this and other horses had recently been infested with ticks. Results of analysis of a sample of CSF were within reference limits, but hematologic abnormalities included lymphopenia, thrombocytopenia, mild anemia, and intracytoplasmic inclusion bodies in neutrophils that were consistent with Anaplasma phagocytophilum (previously Ehrlichia equi). Results of serum biochemical analyses were characteristic of infection and included high, unconjugated bilirubin concentration. Other common causes of recumbency in horses, such as equine protozoal myeloencephalitis, infection with eastern or western equine encephalitis viruses and equine herpesvirus-1, West Nile viral encephalitis, trauma, and metabolic disease, were ruled out. The horse responded quickly to IV administration of oxytetracycline and recovered fully within 6 days.

Original languageEnglish (US)
Pages (from-to)1964-1966+1931
JournalJournal of the American Veterinary Medical Association
Volume224
Issue number12
DOIs
StatePublished - Jun 15 2004

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