Armorphophalus konjac, Maiko.
Incidence: 5 to 16% of exposed subjects.
Neighbours up to 500m away may also be affected.
Atopy probably has an influence.
IgE-dependent mechanism. The allergen is a protein contained in the root.
Powder extracted from the crushed root of a plant called "the devils tongue" which is used in Japanese cooking to make konnyaku.
Asthma in young adults. Sensitization may take up to three years.
Skin tests are possible.
No immunological assay (allergen not commercially available).
Bronchial provocation test (in hospital).