Contact urticaria from mustard in fish-stick production.

At a major fish factory in northern Norway, workers employed in fish-stick and fillet production participated in a survey on skin diseases. 122 (80.1%) of the workers in the fish-stick section responded, but only 60.7% of the fillet workers. Clinical examination and patch testing revealed 16 cases of occupational dermatitis among workers in fish stick production, 3 of whom had contact urticaria from mustard and 8 from fish. There were only found 6 cases of occupational dermatitis among fillet workers; 3 reacted to fish and 3 had irritant contact dermatitis. Working conditions are described for both locations. A greater exposure to irritants may in part explain the 10.7% occupational dermatitis in the fish-stick section compared to only 3.5% in the fillet section.