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年在天津小凑町发生的陆地蚂蝗爆炸性传播进行定点调查。千叶县自1987年以来一直延续。结果表明，1992年水蛭的繁殖和种群数量达到高峰，1993年水蛭的繁殖和种群数量呈下降趋势。可以高度证明，传播的缓解可能是由于所谓的寒冷夏季以及街上鹿散步的减少。2）在丹泽山区（神奈川Pref.）的其他ditant栖息地中，秋田南部教授，金刚山是。（宫城教授）和春日山原始森林（奈良县）与房总半岛相比，在金刚山、春日山等地水蛭与鹿共存的原始栖息地，除了几位生物学家为了追捕鹿而进入灌木丛外，水蛭引起的生物危害在居民中几乎没有发生 ...更多信息 3）1991年在房总区的鹿身上发现，鹿好像是生活在鹿四肢上的陆地水蛭的适当宿主，在鹿的第3- 4趾之间有一种中空的肿瘤，在中空的肿瘤内存在一个进入的水蛭。然而，在这方面，除了房总地区，其他地区都没有发现陆地水蛭和鹿之间的这种奇怪关系。4）传闻中的从头顶上的树上掉下来的攻击永远无法通过室内实验得到证实，实验中使用了10个水蛭个体，放在研究人员头顶20厘米处的树枝上，对着它们吹气。一只流浪狗在水蛭高密度栖息地散步10分钟内被7只水蛭附身，表现出较强的中介能力。在上述7只水蛭中，除饥饿的2只外，已经吸血的5只水蛭在2天内死亡。因此，认为抗水蛭抗体是通过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