Introduction of Reindeer
In 1907 Grenfell imported a group of 300 reindeer from Norway to provide food and serve as draft animals in Newfoundland. Unbeknownst to him, some of the animals carried a parasitic roundworm, Elaphostrongylus rangiferi, that then spread to native caribou herds. The reindeer herd eventually disappeared; however, the parasite took hold and causes cerebrospinal elaphostronglyosis (CSE) in caribou, a disease well known in reindeer in Scandinavia.
Read more about this topic: Wilfred Grenfell
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