Moose, elk, caribou and reindeer have been recorded with hydatid cysts, and wolves with the adult tapeworm in Northwestern Canada. Fresh reindeer hydatid fluid was used to prepare antigen and used in intradermal tests on Indians in Canada's Northwest. The total number of natives tested with this Canadian antigen in two years was 2,022 with 31 per cent giving positive reactions.
Assistant Professor of Parasitology, Macdonald College, McGill University.
Parasitologist, Laboratory of Hygiene, Department of National Health and Welfare, Ottawa, Canada and Research Associate in Parasitology, Macdonald College, McGill University.
Present address: Sterling-Winthrop Research Institute, Rensselaer, N. Y.