Tea-dust induced asthma.

A 55-yr old female worker in a tea-packing production line developed asthma to tea-dust. She had no previous history of chest disease, and skin prick testing to a solution of tea-dust and to a variety of common allergens were all negative. Diagnosis was established by serial peak expiratory flow rate readings. Bronchial provocation challenge with tea-dust demonstrated a late asthmatic reaction.