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Entomologic evaluation of insect hypersensitivity in horses
1Department of Infectious Diseases, College of Veterinary Medicine, University of Florida, Gainesville, USA.
The Veterinary Clinics of North America. Equine Practice
|April 1, 1995
Summary
Identifying biting midges causing insect hypersensitivity in horses is crucial. A Florida study used light traps and horse vacuum collections to pinpoint species responsible for equine Culicoides hypersensitivity.
Area of Science:
- Veterinary Entomology
- Equine Dermatology
- Insect-borne Diseases
Background:
- Insect hypersensitivity is a significant concern in equine health.
- Biting midges, particularly Culicoides species, are implicated in allergic reactions in horses.
- Accurate identification of causative species is essential for effective management.
Purpose of the Study:
- To present methods for identifying insects responsible for insect hypersensitivity in horses.
- To list North American biting midges that attack horses.
- To demonstrate species determination for hypersensitivity using a Florida study.
Main Methods:
- Light trap collections to determine temporal and geographic distribution of potential midge species.
- Vacuum collections from horses to confirm feeding activity and identify species.
- Correlation of midge species with lesion distribution on affected horses.
Main Results:
- Identified specific Culicoides species active in Florida.
- Confirmed feeding patterns of midges on horses.
- Established a link between midge activity periods and equine hypersensitivity cases.
- Demonstrated that different species are active at different times of the year.
Conclusions:
- Insect hypersensitivity in Florida horses is caused by a complex of Culicoides species.
- Integrated trapping and direct horse collection methods effectively identify causative agents.
- Understanding seasonal activity patterns of different midge species is key to managing equine Culicoides hypersensitivity.