Intradermal testing in healthy horses and horses with chronic obstructive pulmonary disease, recurrent urticaria, or allergic dermatitis.
OBJECTIVE
To compare responses to a variety of intradermally injected allergens among healthy horses and horses with chronic obstructive pulmonary disease (COPD), recurrent urticaria (RU), and atopic dermatitis-insect hypersensitivity (allergic dermatitis [AD]).


METHODS
Case-control study.


METHODS
86 horses.


METHODS
Results of intradermal testing for horses with COPD, RU, or AD were compared with results for healthy horses.


RESULTS
Compared with healthy horses, horses with COPD, RU, and AD were significantly more likely to have positive (> or = 3+) reactions to intradermal allergens (molds, weeds, trees, grasses-crops, and insects) 30 minutes (immediate reaction), 4 hours (late-phase reactions), and 24 hours (delayed-phase reactions) after exposure. In addition, diseased horses reacted to a significantly higher number of allergens in each allergen group than did healthy horses.


CONCLUSIONS
Reactions to individual allergens should not be used to determine that horses have hypersensitivity. Overall patterns of reactivity to intradermal allergens may be helpful in management when used in conjunction with a compatible history and evidence of potential exposure to allergens in horses with conditions associated with hypersensitivity to environmental allergens.
Jose-Cunilleras
E
E
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus 43210, USA.
Kohn
C W
CW
Hillier
A
A
Saville
W J
WJ
Lorch
G
G
D000485:Allergens; D000818:Animals; D001992:Bronchoalveolar Lavage Fluid; D016022:Case-Control Studies; D003876:Dermatitis, Atopic / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D005260:Female; D006734:Horse Diseases / Q000175:diagnosis / Q000276:immunology*; D006736:Horses; D006968:Hypersensitivity, Delayed / Q000175:diagnosis / Q000662:veterinary; D006969:Hypersensitivity, Immediate / Q000175:diagnosis / Q000662:veterinary; D007428:Intradermal Tests / Q000662:veterinary; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D012008:Recurrence; D013997:Time Factors; D014581:Urticaria / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*
D000485:Allergens