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Plasmodium malariae: Ring Stage Parasites

Smears from patients:
Plasmodium malariae rings have sturdy cytoplasm and a large chromatin dot. The red blood cells (RBCs) are normal to smaller than normal (3/4 x) in size.

A B C D


A, B, C: Ring forms in thin blood smears.
D: A thick blood smear showing two rings (lower right) and a gametocyte.


Plasmodium malariae: Trophozoites

Smears from patients:
Plasmodium malariae trophozoites have compact cytoplasm and a large chromatin dot. Occasional band forms and/or "basket" forms with coarse, dark-brown pigment can be seen.

A B C


A, B, and C:Mature trophozoites in thin blood smears. A and B are band forms. C is a "basket" form.


Plasmodium malariae: Schizonts

Smears from patients:
Plasmodium malariae schizonts have 6 to 12 merozoites with large nuclei, clustered around a mass of coarse, dark-brown pigment. Merozoites can occasionally be arranged as a rosette pattern. The red blood cells (RBCs) are normal to smaller than normal (3/4 ?) in size.

A B C D


A, B, C: Schizonts of P. malariae in thin blood smears. C has the appearance of a rosette pattern.
D: Thick blood smear showing a schizont.

Plasmodium malariae: Gametocytes

Smears from patients: Plasmodium malariae gametocytes are round to oval with scattered brown pigment; may almost fill red blood cell (RBC). The RBCs are normal to smaller than normal (3/4 X) in size.

A B C

A, B: Gametocytes in thin blood smears.
C: A thick blood smear showing a gametocyte (upper left) and two rings.

 

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