Abstract
Hyogo Society of Clinical Dermatologists reported the statistics of chickenpox and adult chickenpox on the basis of the skin disease surveillance data, which had been collected since March 1986. It was observed that the incidence of chickenpox tended to be the lowest in October and there after in creased from the winter to early summer. Further more, the incidence of adult chickenpox completely changed in parallel with that of chickenpox. Thus, the proportion of the cases of adult chickenpox to the cases of all chickenpox always remained fixed (11% to 12%). Over a period of 6 years (1987 to 1992), the reported 4,592 cases of chickenpox (including 569 cases of adult chickenpox) were evaluated according to sex and age. The entire proportion of males to females was found to be a ratio of 1:1.1. In the cases of adult chickenpox alone, the proportion was 1:1.6, without indicating any remarkable significant difference between female and male. Especially in regard to female in their twenties, the cases of adult chickenpox were 2 times those of male in their twenties. The results are ascribable to the fact that there are many chances to become infected from childhood. In regard to the patients above thirty, the proportion of male to female was reversed. In other words, the number of male cases tended to be higher than the female cases. The incidence of herpes zoster was found to be almost the opposite of chickenpox in view of the monthly and yearly changes. In brief, the incidence of one disease in creased while the incidence of the other disease decreased. It is unknown why there is an inverse relation between the two types of incidence for those two diseases which are caused by the same virus.
