JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
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A double blind, randomized, placebo controlled trial of the efficacy, quality of life and safety of food allergen-specific sublingual immunotherapy in client owned dogs with adverse food reactions: a small pilot study.

BACKGROUND: Food allergen-specific sublingual immunotherapy (FA-SLIT) has emerged as a novel and successful approach for desensitizing human patients to specific food allergens. It has not been tested in dogs.

OBJECTIVE: To investigate the efficacy, quality of life (QoL), tolerability and safety of FA-SLIT in dogs with adverse food reactions (AFR).

METHODS: Dogs with proven AFR were randomized to treatment (T group; n = 7) or placebo (P group; n = 6) to receive either FA-SLIT (based on the results of a food elimination trial) or glycerinated saline, respectively. The treatment was continued daily for 6 months with fortnightly dosage escalations. To evaluate the treatment, pruritus Visual Analog Scale (pVAS), Canine Atopic Dermatitis Extent and Severity Index (CADESI-04), QoL, faecal consistency scores, owner assessment, overall tolerability scores and blood analyses were assessed.

RESULTS: Eleven dogs completed the study, two dogs in the T group were withdrawn by the owner after FA-SLIT exacerbated clinical signs of AFR. Statistical tests showed significant protection against food challenge induced clinical signs following FA-SLIT therapy, as indicated by reduced pVAS and CADESI scores (P < 0.05). The QoL did not differ between groups. The treatment was rated as effective or quite effective by 80% of the owners, whereas placebo was rated as ineffective by all owners.

CONCLUSIONS AND CLINICAL IMPORTANCE: FA-SLIT was effective, well tolerated and safe. No severe adverse events were recorded; erythema and pruritus were reported in association with only 0.7% of the dispensed doses. Larger clinical trials with more extended maintenance immunotherapy periods will be needed to provide more precise estimates of efficacy and frequency of adverse events.

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