The protozoan (Plasmodium vivax) that causes the most common form of malaria.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Historical Examples of vivax
The three most common species are vivax, malariæ and falciparum, causing respectively the tertian, quartan and remittent fevers.Insects and Diseases
Rennie W. Doane