Plasmodium malariae

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Plasmodium malariae
Giemsa-stained micrograph of a mature Plasmodium malariae schizont
Giemsa-stained micrograph of a mature Plasmodium malariae schizont
Scientific classification
Kingdom: Protista
Phylum: Apicomplexa
Class: Aconoidasida
Order: Haemosporida
Family: Plasmodiidae
Genus: Plasmodium
Species: P. malariae
Binomial name
Plasmodium malariae
Feletti & Grassi, 1889

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Please Take Over This Page and Apply to be Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us [1] to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch. Plasmodium malariae is a parasitic protozoa that causes malaria in both humans and dogs. It is closely related to Plasmodium falciparum and Plasmodium vivax which are responsible for most malarial infection. It is a so-called "benign malaria" and is not nearly as dangerous as that produced by P. falciparum or P. vivax. P. malariae causes fevers that recur at approximately three-day intervals (a quartan fever), longer than the two-day intervals of the other malarial parasites.

Microscopically, the parasitised red blood cell (erythrocyte) is never enlarged and may even appear smaller than that of normal red blood cells. The cytoplasm is not decolorized and no dots are visible on the cell surface. The food vacuole is small and the parasite is compact. Cells seldom host more than one parasite. Band forms, where the parasite forms a thick band across the width of the infected cell, are characteristic of this species (and some would say is diagnostic). Large grains of malarial pigment are often seen in these parasites: more so than any other Plasmodium species. 8 merozoites

P. vivax and P. ovale that has been sitting in EDTA for more than half-an-hour before the blood film is made will look very similar in appearance to P. malariae, which is an important reason to warn the laboratory immediately when the blood sample is drawn so they can process the sample as soon as it arrives.

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