Fifty patients with recurrent urticaria were tested by means of the RAST test for penicillin allergy. Fifteen patients had positive reactions and of these, thirteen received provocation tests with 0.1 U/ml of penicillin in milk. Four had definite positive reactions, three doubtful reactions and six had no reaction. Although there has been improvement in the purity of milk, penicillin residues remain a potential cause of urticaria even in very low amounts and could have contributed to the urticaria in at least 8% of our patients. Veterinary use of antibiotics and food quality should be strictly regulated to prevent contamination of our diet.
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