| Plasmodium kochi | A Plasmodium species now recognised as Hepatocystis kochi. (05 Mar 2000) |
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| plasmodium malariae | A protozoan parasite that occurs primarily in subtropical and temperate areas. It is the causal agent of quartan malaria. As the parasite grows it exhibits little ameboid activity. (12 Dec 1998) |
| Plasmodium ovale | A species that is the agent of the least common form of human malaria; resembles Plasmodium vivax in its earlier stages, but often modifies the cell membrane, causing it to form a fimbriated outline, and often assume an oval shape; Schuffner's dots are abundant and appear early, host cells are normal or only slightly enlarged, and only about 8 to 10 grapelike merozoites are produced; fever is tertian (every 48 hours), and relapses are infrequent. (05 Mar 2000) |
| Plasmodium relictum | A species of worldwide distribution found in pigeons, doves, ducks, swans, and a great variety of other birds; it is highly pathogenic in pigeons, game birds, and others to which this strain is poorly adapted, causing anaemia, weakness, and often death. (05 Mar 2000) |
| plasmodium vivax | A protozoan parasite that causes vivax malaria (malaria, vivax). This species is found almost everywhere malaria is endemic and is the only one that has a range extending into the temperate regions. (12 Dec 1998) |
| plasmodium yoelii | A species of plasmodium causing malaria in rodents. (12 Dec 1998) |