Plasmodium ovale
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Plasmodium ovale is a species of parasitic protozoon that causes tertian malaria in humans. It is one of several species of Plasmodium parasites that infect humans, including Plasmodium falciparum and Plasmodium vivax which are responsible for most cases of malaria in the world. P. ovale is rare compared to these two parasites, and substantially less dangerous than P. falciparum.
Microphotographs of Plasmodium ovale in Giemsa-stained thin blood films. a–c ring stages, d, e young trophozoites, f trophozoite, g late trophozoite, h young schizont, i–k growing schizont, l late schizont, m ruptured schizont, n young gametocyte, o, p developing macrogametocytes, q macrogametocyte, r microgametocyte.
Plasmodium malariae
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Plasmodium malariae is a parasitic protozoan that causes malaria in humans. It is one of several species of Plasmodium parasites that infect other organisms as pathogens, also including Plasmodium falciparum and Plasmodium vivax, responsible for most malarial infection. Found worldwide, it causes a so-called "benign malaria", not nearly as dangerous as that produced by P. falciparum or P. vivax. The signs include fevers that recur at approximately three-day intervals – a quartan fever or quartan malaria – longer than the two-day (tertian) intervals of the other malarial parasite.
Plasmodium malariae wiki