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The life history of that parasite is not well known, but it may easily develop that the cycle of its maximum destructiveness is seven years, and therefore it may be accountable for the seven-year plague among the hares and rabbits of the northern United States and Canada. Possibly Strongylus strigosus is all that stands between Canada and a pest of rabbits like that of Australia.
They were found to be infested by great numbers of a dangerous bloodsucking parasite known as Strongylus strigosus, which produces death by anemia and emaciation. There were hundreds of those parasites in each animal. I assisted in the examination, and was shown by Dr. Blair, under the microscope, that Strongylus puts forth eggs literally by hundreds of thousands!
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