AAEP Issues Field Diagnostic Guidelines for Equine Infectious Respiratory Disease

Horse with obvious respiratory issues coughing in area with poluted air.
Horse with obvious respiratory issues coughing in area with poluted air. Equine Guelph

Newsdate: Wednesday, October 1, 2025 - 11:00 am
Location: LEXINGTON, Kentucky

The American Association of Equine Practitioners (AAEP) has published on its website Field Diagnostic Guidelines for Equine Infectious Respiratory Disease to assist practitioners with development of differentials and diagnostic strategies for approaching equine respiratory disease of unknown etiology.

Horses grazing in pasture under hazy, smoke polluted air.

Horses grazing in pasture under hazy, smoke polluted air.

The diagnostic flowchart contained within the guidelines will help practitioners navigate their differential list, sample collection and diagnostic test selection to achieve a definitive diagnosis.
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Equine respiratory disease etiologies range from viral and bacterial infections to environmental allergens or inflammatory factors. Diagnostic testing to determine etiology is strongly recommended to provide targeted treatment strategies, implement biosecurity protocols if necessary, and support overall herd health. Multiple febrile animals or one or more horses with acute respiratory abnormalities and fever are suggestive of underlying infectious disease and should prompt practitioners to implement biosecurity practices and establish a quarantine on the premises.

The diagnostic flowchart contained within the guidelines will help practitioners navigate their differential list, sample collection and diagnostic test selection to achieve a definitive diagnosis.

“There are many considerations involved in differentiating the cause of equine respiratory disease so it is our hope that these field diagnostic guidelines will be a convenient and valuable resource for equine practitioners when confronted with such cases,” said Toby L. Pinn-Woodcock, DVM, DACVIM, chair of the AAEP’s Field Guidelines Subcommittee and associate clinical professor, Department of Population Medicine and Diagnostic Sciences, at Cornell University College of Veterinary Medicine.

Authored collaboratively by the members of the AAEP Field Guidelines Subcommittee, the Field Diagnostic Guidelines for Equine Acute Respiratory Disease were reviewed and approved by the AAEP Infectious Disease Committee and board of directors. View the guidelines or save them to your mobile device at https://aaep.org/resource/equine-infectious-respiratory-disease-field-diagnostic-guidelines.

This is the third set of Field Diagnostic Guidelines published by the AAEP and follows previous issuance of similar step-by-step protocols for Infectious Neurologic Disease and for Acute Infectious Diarrhea. All AAEP Field Diagnostic Guidelines are accessible at https://aaep.org/guidelines-resources/field-diagnostic-guidelines.

About AAEP

The American Association of Equine Practitioners, headquartered in Lexington, Ky., was founded in 1954 as a non-profit organization dedicated to the health and welfare of the horse. Currently, AAEP reaches more than 5 million horse owners through its over 9,000 members worldwide and is actively involved in ethics issues, practice management, research and continuing education in the equine veterinary profession and horse industry.


Press release by Amy Sales

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