the transmission potential of lymphatic filariasis. Of the 520 known arboviruses, 100 cause human disease. Animals are the normal reservoirs of arboviruses and many of the human diseases caused by them are zoonoses. Arbovirus disease increases when man's activities cause gross disturbance to pristine environments, which brings may into close proximity to animal hosts and vectors (Fienes, 1978; Walsh et al., 1993). The effect of human migration and habitat modification on arbovirus disease is dramatically portrayed by looking at its effects on Kyasanur Forest Disease, a tick-borne arbovirus disease discovered in India in 1957 (Walsh et al., 1993; Banerjee, 1996). When first discovered the disease was confined to a very localized area. The disease quickly moved outwards from its local focus and by 1966 was endemic across an area of 1300 km 2 . The number of cases rose from 75 cases in 1957 to 1555 cases in 1983. The reason for the spread of disease and increased cases was due to human migration and habitat modification. Groups of people and cattle moved into the forest to be close to fuel-wood. Trees were cut down to provide the fuel-wood, to make room for housing, and to provide grazing for the cattle. Nomadic behavior resulted in the cleared areas experiencing profuse growth of lantana vine. This vine grows rapidly in second-growth forest and clearings. The vine thickets provide the ideal habitat for small mammals and birds, which act as hosts for immature ticks. Cattle were left to graze in the forest