Alnus Sieboldiana (Alder) Pollinosis at the Base of Rokko Mountains.

Alnus sieboldiana (alder) was thickly planted against floods or after land development at the base of Mt. Rokko. This investigation of 272 patients with spring hay fever due to Japanese cedar or alnus sieboldiana showed a correlation between the positive rate of the radioallergosorbent test to alder and alder pollen counts. Seventy three patients with alnus sieboldiana pollen allergy answered a questionnaire about food hypersensitivity. Hypersensitivity to apples was reported by twenty-two per cent of the patients. All of the 7 applehypersensitive patients had positive IgE antibodies to apples.