Evaluation of the clinical and allergen specific serum immunoglobulin E responses to oral challenge with cornstarch, corn, soy and a soy hydrolysate diet in dogs with spontaneous food allergy.
Fourteen dogs with known clinical hypersensitivity to soy and corn were maintained on a limited antigen duck and rice diet until cutaneous manifestations of pruritus were minimal (78 days). Sequential oral challenges with cornstarch, corn and soy were then performed. Subsequently, the dogs were fed a diet containing hydrolysed soy protein and cornstarch. Throughout the study period the dogs were examined for cutaneous manifestations of pruritus and, additionally, serum was collected for measurement of allergen-specific and total immunoglobulin (Ig)E concentrations. Intradermal testing with food antigens was performed prior to entry into the study and after 83 days. A statistically significant clinical improvement was measured between days 0 and 83. Significant pruritus was induced after oral challenge with cornstarch, corn and soy (P = 0.04, 0.002, 0.01, respectively) but not with the hydrolysed diet (P = 0.5). The positive predictive value of the skin test for soy and corn allergy was reduced after feeding a soy and corn free diet. Although increases in soy and corn-specific serum IgE concentrations were measured in individual dogs post challenge they were not statistically significant and could not be used to predict clinical hypersensitivity.
Jackson
H A
HA
Department of Clinical Sciences, Farm Animal Health and Resource Management, North Carolina State University, 4700 Hillsborough Street, Raleigh, North Carolina 27606, USA. Hilary_Jackson@ncsu.edu
Jackson
M W
MW
Coblentz
L
L
Hammerberg
B
B
D000821:Animal Feed; D000818:Animals; D000941:Antigens; D004032:Diet; D004283:Dog Diseases / Q000097:blood / Q000175:diagnosis* / Q000276:immunology*; D004285:Dogs; D005260:Female; D005512:Food Hypersensitivity / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D007073:Immunoglobulin E / Q000097:blood* / Q000276:immunology; D007428:Intradermal Tests / Q000592:standards / Q000662:veterinary*; D008297:Male; D011237:Predictive Value of Tests; D030262:Soybean Proteins / Q000276:immunology; D013025:Glycine max / Q000276:immunology; D003313:Zea mays / Q000276:immunology
D000941:Antigens; D030262:Soybean Proteins; D007073:Immunoglobulin E