Japanese Cedar Pollinosis in the South of Ibaraki Prefecture.

概要

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A clinical study of 1206 patients with Japanese cedar pollinosis treated between January 1975 and December 1999 was performed and in addition, the amount of Japanese cedar and cypress pollen in the south of Ibaraki Prefecture was measured every spring from 1981 to 1999 (19 years).The following findings were observed.1) The age distribution of Japanese cedar pollinosis was highest in the 30-39-year-old group of females. In the younger age group (10 years or youger), pollinosis was more common in males than females.2) The skin test positive rate for house dust (HD) was 46.3%. The positive rate for pollens, orchard grass, short ragweed, lesser reedmace and Japanese hops, was 16.9, 20.2, 14.6 and 3.9%, respectively.3) The RAST positive rate for mites and HD was 46.3 and 21.3%, respectively. The positive rate for pollens, orchard grass, short ragweed and mugwort, was 19.9, 14.8 and 9.5%, respectively.4) The mean pollen count of Japanese cedar and cypress over the 19 year period was 4298.5/cm2. The highest pollen count was 16987/cm2 in 1995.5) A correlation was noted between the annual variations in the Japanese cedar and cypress pollen counts and the annual change in Japanese cedar pollinosis patient numbers. Since the peak in 1995, Japanese cedar pollinosis has tended to increase.