花粉症の研究 : I. 空中花粉の季節的変動

抄録

Pollinosis is one of the common diseases in the United States and European countries, while it is still in question whether pollinosis really occurs in Japan or not. This discrepancy might be attributed either to the differences in the racial disposition or the atmospheric pollen contents, or the lack of investigation on pollinosis in this country. Hitherto there had been no report on atmospheric pollen counts in Japan. Therefore pollen counts were carried out in Tokyo and its neighbouring town Narashino during 1957 and 1958. Gravity slide method was used, in which each slides were exposed to air for 24 hours from 9.00 a.m. to 9.00 a.m. The result obtained were illustrated in the figures. It was shown that pollen curves in Tokyo and its vicinity consisted of three parts, corresponding to tree, grass, and weed pollens. In other words, there were three pollen seasons in this area like in U.S.A. Pollination period of trees ranged from February or March to June. Japan Cedar and Pine were prevalent. Marked peaks of Pine were found in late April and early May, with a maximum count of 144 in Tokyo. Pollination of grasses began in April and continued till October, whereas their pollen counts were considerably low, especially in June and July (rainy season). Prdominant pollens of the grass curve were of Dactylis glomerata, Alopecurus aequalis, and Miscanthus sinensis. The weed season ranged from August to October. The prevalent pollen was of Short ragweed (Ambrosia Artemisiifolia var.elatio). The peaks were observed in late August and early September, with a maximum count of 95 in Narashino. Giant ragweed was very few and no other ragweed in this area. Comparing with the results of some surveys in U.S.A., the present study seemed to indicate that in Tokyo and its vicinity the pollen concentrations, especially of Short ragweed, were generally lower, but not so extremely lower than those in U.S.A.