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Malaria, a protozoan disease caused by infection with various species of Plasmodium, is transmitted solely by mosquitoes in nature. The transmission of human malaria depends entirely on certain species of Anopheles. The occurrence of a number of cases of Korean vivax malaria in Canada gave ris: to some speculation as to the possibility of the disease becoming re-established in the country (Neufeld 1952, O'Rourke 1953, 1955).
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