Problems on the land leech-induced biohazard spreading in various districts of Japan--Especially the environmental-medical pursuance in southern area of Boso Peninsula--

1)对1985年发生在松小明町的陆地水蛭爆炸繁殖的定点调查。千叶县自1987年延续至今。结果表明，水蛭的繁殖和数量在1992年达到顶峰，之后在1993年呈下降趋势。可以充分证明，鹿的繁殖减缓可能是由于所谓的夏季寒冷和鹿在街道上散步的减少造成的。2)金山县秋田教授南部的坦泽山区（神奈川县）其他不同栖息地的土地水蛭状况。（Miyagi教授）和Kasugayama原始森林（Nara Pref）与Boso半岛进行了对比研究。在原生地，水蛭与鹿共存的地方，如Kinkazan和Kasuga-yama，水蛭引起的生物危害很少发生在居民身上，除了一些生物学家为了追捕鹿而进入丛林…更多的是为了寻找特殊生物。(3) 1991年在博索地区的鹿身上发现，鹿似乎是生活在鹿肢上的陆地水蛭的合适宿主，在鹿的3-4个脚趾之间有一种空心肿瘤，空心肿瘤内存在一条进入的水蛭。然而，这种奇特的陆地水蛭和鹿之间的关系，除了博索地区，在其他栖息地是看不到的。4)把水蛭的10个个体放在一根树枝上，放在距离吹气的研究人员头顶20厘米的地方，这种室内实验永远无法证明从头顶上的树上坠落的谣言。5)流浪狗对水蛭具有很强的调解能力，在水蛭高发区散步10分钟内就有7只流浪狗对水蛭产生调解作用。上述7条水蛭中，除饥饿的2条外，已吸血的5条均在2天内死亡。据此认为，抗陆水蛭抗体是由陆水蛭反复吸血在犬体内产生的。少

1) Fixed point ivestigation on the explosive propagation of the land leech that occured in 1985 in Amatsu-Kominato-machi. Chiba Prefecture was continued since 1987. As As the sesults, the propagation and the leech population reached at peak in 1992, but after then these showed finally a downward tendency in 1993. It is highly provable that the mitigation of the propagation might be caused by the both of so-called cold summer as well as decrease of stroll of the deers in the street.2) The state of land leech in other ditant habitates in Tanzawa mountainious area (Kanagawa Pref.), Southern part of Akita Prof., Kinkazan is. (Miyagi Prof.) and Kasugayama primeval forest (Nara Pref.) were explored in comparing with that of Boso Peninsula In original habitates, where the land leechs coexist with the deers, such as Kinkazan and Kasuga-yama, the leech-induced biohazard scarcely occured in the inhabitants except for such persons as several biologists who enter the bushed in order to pursue deer … More s orto seek peculiar organisms.3) It was found in the deers of Boso distrct in 1991 that the deers acted as if the proper host of the land leechs which lived upon the extremities of deers and that there was a kind of hollowed tumor, within the hollow of which existed a entering leech, between the 3-4th toes of deers. However, the curious relationship of this kind between land leechs and deers could not be seen in other habitates than Boso district.4) The rumored falling attack from overhead tree could be never proven by indoor experiment using 10 indivisuals of the leech on a tree-branch that was put 20 cm over the head of the researcher who blowed his expiration against them.5) A stray dog showed a powerful mediating ability against he leech and possesed by seven individuals within 10 minutes strolling through the habitate with high population of the leech. The 5 individuals, which blood-sucked the dog already excepting hungry 2 individuals, among the avobe-mentioned 7 individuals of the leech died within 2 days. Accordingly it was considered that the anti-land leech antibody was produced in the dog through repeated blood-sucking by land leeches. Less