Infestation with certain species of ticks gives rise in a number of animals to a paralysis which if unrelieved may end in death. The effect of such parasites is felt particularly in the ranching areas of South Africa and along the east coast of Australia, where sheep and dogs respectively are principally affected, and in cattle ranches west of the Rocky Mountains in Canada and the north-western United States. In this last area the condition is produced by the bite of the ixodid tick Dermacentor andersoni Stiles (Gregson, 1953).

Copyright © 1960 The Company of Biologists Ltd.
1960
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