抄録
From January 1972 to June 1978, 293 cases with nasal allergy were observed in the south of Ibaraki Prefecture, Japan. There were 81 cases of house dust allergy, 36 cases of pollinosis (Japanese cedar, orchard grass, ragweed and narrow-leaved cattail) and 10 cases of mold allergy. In these pollinosis, 22 cases of Japanese cedar pollinosis were found.
From April 1977 to June 1978, air-borne pollen grains were collected at Tsuchiura, Ibaraki Prefecture. The obtained pollen grains were Cryptomeraceae, Pinaceae, Fagaceae, Ulumaceae, Butaraceae, Graminaceae, Uluticaceae, Polygonaceae and Moraceae.
Among these grains, Cryptomeraceae (Japanese cedar) and Pinaceae (Pine) were conspicuous. In this district, the pollens of Japanese cedar appeared to be the most important cause of pollinosis.
