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Potomac horse fever

J E Palmer1

  • 1Department of Clinical Studies, New Bolton Center, University of Pennsylvania School of Veterinary Medicine, Kennett Square.

The Veterinary Clinics of North America. Equine Practice
|August 1, 1993
PubMed
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Ehrlichia risticii causes two equine diseases, EEC and EEA. While transmission is unknown, effective treatments for EEC exist, but prevention and complete protection via vaccination remain challenging.

Area of Science:

  • Veterinary Medicine
  • Infectious Diseases
  • Equine Health

Background:

  • Ehrlichia risticii is identified as the causative agent of two distinct equine disease syndromes: equine ehrlichial colitis (EEC) and equine ehrlichial abortion (EEA).
  • Seroepidemiologic studies indicate widespread E. risticii infection in horses, yet the transmission routes remain unelucidated.
  • EEC, commonly known as Potomac horse fever, manifests with a diverse range of clinical signs, representing the most prevalent clinical presentation.

Purpose of the Study:

  • To review the current understanding of E. risticii-induced diseases in horses, focusing on diagnosis, treatment, and prevention.
  • To highlight the limitations of current diagnostic methods and the potential of emerging techniques.
  • To discuss the challenges in preventing EEC and the efficacy of available vaccines and treatments.

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Main Methods:

  • Review of existing literature on E. risticii, equine ehrlichial colitis (EEC), and equine ehrlichial abortion (EEA).
  • Analysis of diagnostic approaches, including serology and polymerase chain reaction (PCR).
  • Evaluation of therapeutic strategies, such as antimicrobial treatments and vaccination.

Main Results:

  • Intravenous oxytetracycline and oral erythromycin/rifampin combinations show high efficacy in treating EEC.
  • Current serological diagnostics often yield retrospective or non-definitive diagnoses; PCR shows promise but requires further validation.
  • Commercial bacterins offer incomplete protection against E. risticii infections.
  • EEA, a newly recognized syndrome, involves abortion in pregnant mares, potentially due to ehrlichial colitis and placentitis, with antimicrobial and vaccine effects yet to be determined.

Conclusions:

  • Effective treatments for EEC exist, but the lack of understanding regarding transmission hinders prevention strategies.
  • Accurate and rapid diagnostics are needed, with PCR offering a potential advancement.
  • Vaccination provides partial protection, and the impact of treatments and vaccines on EEA requires further investigation.