Harold C. McKenzie, III, DVM, MS, Diplomate ACVIM

Associate Professor of Medicine

Interim Associate Director
hmckenzi@vt.edu
(703) 771-6803

Dr. McKenzie is an Associate Professor of Equine Medicine and the Interim Associate Director at Virginia Tech’s Marion duPont Scott Equine Medical Center. He earned a doctor of veterinary medicine from the University of Georgia’s College of Veterinary Medicine in 1990. Following graduation, Dr. McKenzie joined Monocacy Equine Veterinary Associates, a private equine practice in Montgomery County, Maryland, where he practiced until 1995. He entered the equine internal medicine residency program at the Marion duPont Scott Equine Medical Center in January 1995 and received a master of science in veterinary medical sciences from the Virginia-Maryland Regional College of Veterinary Medicine in 1998. Dr. McKenzie served as a clinical instructor in equine medicine at the center from 1998 to 2003, assistant professor in equine medicine from 2003 to 2009, and was promoted to his current position in 2009. He achieved Diplomate status in the American College of Veterinary Internal Medicine in 2000. Dr. McKenzie’s research interests include aerosol therapy, respiratory disease, critical care and endocrinology. He is a member of the American Association of Equine Practitioners (AAEP), the American Veterinary Medical Association, the Virginia Association of Equine Practitioners and the Virginia Veterinary Medical Association.

Read Dr. McKenzie’s article, “Your Horse’s Health: Treating Foal Pneumonia” (PDF). Republished by permission from The Middleburg Eccentric.
 

Selected Publications:

  • McKenzie, H.C. Equine Hyperlipidemias. In: Vet Clin N Am: Eq Pract.2011 Aug;27(2): 59–72.
  • Han, J., McKenzie, H.C., McCutcheon, J.M., Geor, R. Glucose and insulin dynamics associated with continuous infusion of dextrose or dextrose and insulin in healthy and endotoxin-exposed horses. Am J Vet Res, 2011 Apr;72(4):522-9.
  • Atherton, R.A., Furr, M.O., McKenzie, H.C., Desrochers, A.M. Efficacy of hyperimmunized plasma in the treatment of horses with acute colitis. J Eq Vet Sci. 2011 Jan;31(1):19-25.
  • Dickey, E. J., McKenzie, H. C. III, Johnson, A. and Furr, M. O. Use of pressor therapy in 34 hypotensive critically ill neonatal foals. Aust Vet J, 2010 December: 88 (12): 472-477.
  • Atherton, R. A., McKenzie H.C. and Furr, M.O. Treatment of Acute Colitis in the Adult Horse. Compend Contin Educ Pract Vet: Equine Ed, 2009 November/December;4(9): 416-427.
  • Atherton, R. A., McKenzie H.C. and Furr, M.O. Acute Colitis: Infectious Causes. Compend Contin Educ Pract Vet: Equine Ed, 2009 October;4(8): 375-380.
  • Atherton, R. A., McKenzie H.C. and Furr, M.O. Acute Colitis: Pathophysiology and Non-Infectious Causes. Compend Contin Educ Pract Vet: Equine Ed, 2009 October;4(8): 366-374.
  • McKenzie, H.C. Feeding management of sick neonatal foals. In: Vet Clin N Am: Eq Pract.2009 April;25(1): 109-119.
  • Han, J. H. and McKenzie, H. C. III. Intermittent peritoneal dialysis for the treatment of acute renal failure in two horses. Eq Vet Educ, 2008 May;20(5): 256-264(9).
  • Dickey, E. J., McKenzie, H. C. III, Brown, J. N. and de Solis, C. N. Serum concentrations of lidocaine and its metabolites after prolonged infusion in healthy horses. Eq Vet J, 2008 June; 40(4): 348-352.
  • Mitchell, E, Furr, MO, McKenzie, H.C. Antimicrobial Therapy for Bacterial Meningitis, Equine Veterinary Education, July 2007, Volume 19, Pages 316-323.
  • Krause, J. B., McKenzie, H.C., Parenteral Nutrition in Foals: A Retrospective Study of 53 Cases (2000-2004), Equine Veterinary Journal, January 2007, Volume 39, Pages 74-78.
  • Navas de Solis, C., McKenzie, H.C., Serum Concentrations of Lidocaine and Its Metabolites MEGX and GX During and After Prolonged Intravenous Infusion of Lidocaine in Horses Following Colic Surgery, Journal of Equine Veterinary Science, 2007, Volume 27, Pages 398-404.
  • Mitchell E., Furr M.O. and McKenzie H.C., Bacterial Meningitis in Five Mature Horses, Equine Veterinary Education, 2006 Oct, Volume 8, Pages 321-327.
  • McKenzie H.C., Treating Foal Pneumonia, Compendium: Equine Edition Spring 2006. (View PDF)
  • Atherton R.A., McKenzie H.C., Alternative Antimicrobials in the Treatment of Equine Proliferative Enteropathy. Journal of Equine Veterinary Science, 2006, Volume 26, Pages 535-541.
  • Furr M.O., McKenzie H.C., Saville W.J.A., Dubey J.P., Reed S.M., Davis W., Prophylactic Administration of Ponazuril Reduces Clinical Signs and Delays Seroconversion in Horses Challenged with Sarcocystis Neurona, American Society of Parasitologists, 2006.
  • Johnson A.L., Divers T.J., Freckleton M.L.,McKenzie H.C., Mitchell E., Cullen J.M., McDonough S.P., Fall Panicum (Panicum dichotomiflorum) Hepatotoxicosis in Horses and Sheep, ACVIM, 2006.
    (View PDF) JVIM Online Journals
  • Pantaleon L.G., Furr M.O., McKenzie H.C., Donaldson L., Cardiovascular and Pulmonary Effects of Hetastarch Plus Hypertonic Saline Solutions During Experimental Endotoxemia in Anesthetized Horses, Journal of Veterinary Internal Medicine, 2006, Volume 20, Pages 1422-1428.
    (View PDF) JVIM Online Journals
  • Brandstetter L.R., Doyle-Jones P.S., McKenzie H.C., Persistent Vaginal Haemorrhage Due to Uterine Leiomyoma in a Mare, Equine Veterinary Education, Jun-05.
  • McKenzie H.C., Characterization of Antimicrobial Aerosols for Administration to Horses, Veterinary Therapeutics, Sep-03.
  • McKenzie H.C. and Furr M.O., Aminoglycoside Antibiotics in Neonatal Foals, Compendium: Equine Edition Vol. 25 No. 6 June 2003. (View PDF)
  • Dunkel B. and McKenzie H.C., Severe Hypertriglyceridaemia in Clinically Ill Horses: Diagnosis, Treatment and Outcome, Equine Veterinary Journal, 2003, Volume 35, Pages 590-595.
  • Lopes M.A.F., Hepburn R.J., McKenzie H.C., Sykes B.W., McGhee J.D, Enteral Fluid Therapy for Horses, Compendium on Continuing Education for the Practicing Vet, 2003, Volume 25, Pages 390-397.
  • McKenzie H.C. and Furr M.O., Equine Neonatal Sepsis: The Pathophysiology of Severe Inflammation and Infection, Compendium: Equine Edition Vol. 23 No. 7 July 2001. (View PDF)
  • Corley K.T., McKenzie H.C., Amoroso L.M., Furr M.O., Initial Experience with Norepinephrine Infusion in Hypotensive Critically Ill Foals, Veterinary Emergency Critical Care, 2001, Pages 267-276.
  • McKenzie H.C., Murray M.J., Concentrations of Gentamicin in Serum and Bronchial Lavage Fluid After Intravenous and Aerosol Administration of Gentamicin to Horses, American Journal of Veterinary Research, Oct-00.

Book chapters

  • McKenzie, H.C. and Mair, T. Equine Salmonellosis. In: Mair, T.S and Hutchinson, R.E., eds. Infectious Diseases of the Horse. 1st ed. Fordham, UK: Equine Veterinary Journal Ltd., 2009.
  • McKenzie, H.C. Equine Proliferative Enteropathy: Lawsonia intracellularis. In: Mair, T.S and Hutchinson, R.E., eds. Infectious Diseases of the Horse. 1st ed. Fordham, UK: Equine Veterinary Journal Ltd., 2009.
  • McKenzie, H.C. Antimicrobial therapy of the respiratory system. In: N. Edward Robinson and Kim Sprayberry, eds. Current Therapy in Equine Medicine. 6th ed. Philadelphia, PA: W. B. Saunders Co., 2009.
  • McKenzie, H.C. Pathophysiology, diagnosis and treatment of enteritis and colitis. In: White, N.A, Mair, T, Moore, J.N. eds. The equine acute abdomen. 2nd ed. Jackson, WY: Teton NewMedia, 2009.
  • McKenzie, H.C., Dunkel, B., Roberts, V., McKane, S. Common problems encountered in the hospitalised horse. In: Corley, K. ed. The hospitalised horse. Oxford, UK. Blackwell Publishing, 2008.
  • McKenzie, H.C. Monitoring and treating the respiratory system. In: Corley, K. ed. The hospitalised horse. Oxford, UK. Blackwell Publishing, 2008.

Presentations:

  • Equine lower respiratory disease: Diagnosis and Management. Virginia Veterinary Medical Association Annual Meeting, Williamsburg, February 2001.
  • Equine gastroscopy, cystoscopy and hysteroscopy. 138th Annual Convention, American Veterinary Medical Association, Boston, August, 2001.
  • Wet Lab: Upper Airway endoscopy, sinoscopy, and gastroscopy, Parts I & II. Sullins K., McKenzie, H.C. 138th Annual Convention, American Veterinary Medical Association, Boston, August, 2001.
  • Equine lower respiratory disease. Maryland Veterinary Medical Association Annual Fall Meeting, Laurel, October 2001.
  • Neonatal sepsis. Maryland Veterinary Medical Association Annual Fall Meeting, Laurel, October 2001.
  • Diagnosis and management of the septic foal. 42nd Annual Veterinary Conference, The University of Georgia College of Veterinary Medicine, Athens, GA, April 2005.
  • Aerosolized antimicrobials in equine medicine. 42nd Annual Veterinary Conference, The University of Georgia College of Veterinary Medicine, Athens, GA, April 2005.
  • Pathophysiology and treatment of pneumonia in foals. 23rd Veterinary Medical Forum, American College of Veterinary Internal Medicine, Baltimore, MD, June 2005.
  • Bronchoscopic lavage for the treatment of focal pneumonia. 23rd Veterinary Medical Forum, American College of Veterinary Internal Medicine, Baltimore, MD, June 2005.
  • Management of inflammatory airway disease in the equine athlete. 2nd Annual Performance Horse Seminar presented by B.W. Furlong and Associates and Equine MRI of New Jersey. Oldwick, NJ. October, 2006.
  • Immunomodulatory Therapy: Fact or fiction? 2nd Annual Performance Horse Seminar presented by B.W. Furlong and Associates and Equine MRI of New Jersey. Oldwick, NJ. October, 2006.
  • Aerosol therapy for lower airway inflammation and infectious disease. 2nd Annual Performance Horse Seminar presented by B.W. Furlong and Associates and Equine MRI of New Jersey. Oldwick, NJ. October, 2006.
  • Progression and treatment of infectious lower respiratory tract disease in horses. 25th Veterinary Medical Forum, American College of Veterinary Internal Medicine, Seattle, WA, June, 2007.
  • Infectious lower respiratory tract infections in the horse. MVMA Summer Meeting. Ocean City, MD. June, 2007.
  • Immunomodulatory Therapy: Fact or fiction? MVMA Summer Meeting. Ocean City, MD. June, 2007.
  • The systemic inflammatory response syndrome in horses. MVMA Summer Meeting. Ocean City, MD. June, 2007.
  • Management of inflammatory airway disease in the equine athlete. MVMA Summer Meeting. Ocean City, MD. June, 2007.
  • Nutritional support of sick neonatal foals. 53rd Annual Convention of the American Association of Equine Practitioners. Orlando, FL. December, 2007.
  • The heavey horse. Presented with Dr. Bonnie Rush. 53rd Annual Convention of the American Association of Equine Practitioners. Orlando, FL. December, 2007.
  • The heavey horse. Presented with Dr. Peter Morresey. 54th Annual Convention of the American Association of Equine Practitioners. San Diego, CA. December, 2008.
  • Equine Respiratory Disease: From Heaves to Foal Pneumonia. American Association of Equine Veterinary Technicians' Mid-Atlantic Regional Symposium, Leesburg, VA. January, 2009.
  • Respiratory antimicrobial therapy. 27th annual North American Veterinary Conference, Orlando, FL. January, 2010.
  • Foal pneumonia. 27th annual North American Veterinary Conference, Orlando, FL. January, 2010.
  • Lower respiratory infections in the adult horse. 27th annual North American Veterinary Conference, Orlando, FL. January, 2010.
  • Shipping fever. 27th annual North American Veterinary Conference, Orlando, FL. January, 2010.
  • Rhodococcal pneumonia. 27th annual North American Veterinary Conference, Orlando, FL. January, 2010.
  • Equine Pleuropneumonia. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Equine strangles: The problem that just won’t go away. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Foal pneumonia: From neonate to weanling. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Guttural pouch disorders: A real pain in the neck. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Inflammatory airway disease in the horse. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Recurrent airway obstruction: It’s not heaves anymore. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Diagnosis and management of viral respiratory diseases in the horse. Southwest Veterinary Symposium, Fort Worth, TX. September, 2010.
  • Understanding the Equine Metabolic Syndrome. Maryland Veterinary Medical Association Fall Conference, Timonium, MD. November, 2010.
  • Rhodococcal pneumonia. Maryland Veterinary Medical Association Fall Conference, Timonium, MD. November, 2010.