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[Pollen dispersion of cryptmeria japonica in the autumn at the Oita University Faculty of Medicine Complex].

BACKGROUND
It has been reported that Japanese cedar pollinosis patients develop symptoms in the autumn. We investigated the atmospheric Japanese cedar pollen dispersion in the autumn at the Oita University Faculty of Medicine Complex.


METHOD
We set up a Durham sampler on the roof (30 m from the ground) of the Oita University Faculty of Medicine complex and investigated atmospheric pollen counts every day from October 1 to December 31, from 2003 through 2012.


RESULTS
The total pollen counts in the autumn per year ranged from 5.4 to 52.2 (/cm2). The maximum pollen counts per day ranged from 0.6 to 9.6 (/cm2). The number of days with pollen dispersion ranged from 14 to 46 days. Although there was no correlation between the total pollen counts in the autumn and the those of the next spring, there was a significant correlation between the total pollen counts in the autumn and the meteorological conditions in July. In a multivariate logistic regression analysis, the month, temperature, low humidity and wind speed were independently associated with the day of pollen dispersion.


CONCLUSION
A small amount of Japanese cedar pollen was detected during the period from October to December at our institute. It was thought that some of the male flowers formed during the summer bloomed and scattered pollen in the autumn. As the pollen counts in the autumn were low, we need careful studies to determine whether patients with Japanese cedar pollinosis show symptoms in the autumn.