Incidence: undetermined - a single case has been described.
No immunological mechanism has been reported for this one, atopic subject.
The symptoms appeared 24 hours after contact with the allergen in the case described.
Sporadic coryza, breathing difficulties and asthma.
Skin test: negative at 0.1 and 1 mg/ml.
Bronchial provocation test (in hospital) produces both immediate and delayed reactions.