Sensitization to the Candida tropicalis bacteria in petrochemical products, occurring when the powdered product is bagged. This pathology remains rare. Cough, asthma and occasional coryza during working hours with symptom-free periods when away from the factory. No known immunological dosage. Use of bronchial provocation tests has not been reported.
Subjects are often atopic.
An IgE-dependent mechanism has been demonstrated for some metals. Cobalt has been the most widely studied and in this case the pathology of the metal carbides is identical to the occupational allergy to cobalt dust. A cross reactivity may exist between cobalt and nickel. All the surrounding work areas are also likely to be exposed. In the glass industry, the greatest risk occurs when powders are mixed.