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J Am Vet Med Assoc. 1984 May 15;184(10):1277-80.

Effect of hyposensitization on atopic dermatitis in dogs.


In a double-blind study, 51 dogs with clinically defined atopic dermatitis were injected with either alum-precipitated allergen solutions or a placebo. Comparing the treatment results of both groups on the basis of scores for clinical signs, a significant difference in clinical improvement was established in favor of the allergen-treated dogs (P less than 0.01). The proportional changes of scores for clinical signs in the allergen-treated group ranged between +27.3% and -100% (median, -61.5%) and in the placebo group between +36.4% and -100% (median, 0.0%) with respect to the initial scores. Immediate skin test reactivity disappeared only in the dogs with a good clinical response. Of 27 dogs treated with an allergen solution, 16 (59.3%) had an improvement of 51% or more. In the placebo group, 5 of 24 dogs (20.8%) reacted this way. There was total remission of the clinical signs in 9 and 4 dogs, respectively. In the dogs in which, after 9 months of hyposensitization, any improvement was observed, the chance for final improvement of more than 51% was calculated as 84%. Discriminant analysis revealed that evaluation of the effect of immunotherapy can be restricted to the 9-month follow-up examination.

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