1987 Volume 61 Issue 5 Pages 574-580
Geographically extension of epidemics on Influenza (area-to-area spread) was surveyed during the epidemic period from 1985 to 1986 in Kyushu island. Among 36 intensive B zones of Person Trip Survey organized by several administrative areas in Fukuoka prefecture, when the correlation coefficients were caluculated between person trip and spread of epidemics regarding each intensive B zone as the starting point of influenza epidemic, these of Kokurakita and Tobata zones of Kitakyushu city, which were r=-0.355 (n=33) and r=-0.409 (n=24) each, were statistically significant at 5% level. Furthermore, the area-to-area spread of influenza epidemics was visualized on the isopleth map of Kyushu island on the basis of the closure in class or school. With respect to the isopleth patterns, there are the differences between north and south area of Kyushu island, and between virus types.
