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Plasmodium ovale: Ring Stage Parasites

Smears from patients:
Plasmodium ovale rings have sturdy cytoplasm and large chromatin dots. Red blood cells (RBCs) are normal to slightly enlarged (1 1/4 X), may be round to oval, and are sometimes fimbriated. Schuffner's dots are visible under optimal conditions.

A B C D


A, B: P. ovale rings in thin blood smears. A shows fimbriation of the infected RBC. B shows Schuffner's dots.
C, D: Rings of P. ovale in thick blood smears.


Plasmodium ovale: Trophozoites

Smears from patients:
Plasmodium ovale trophozoites have sturdy cytoplasm, large chromatin dots, and can be compact to slightly amoeboid. Red bl;ood cells (RBCs) are normal to slightly enlarged (1 1/4 ?), may be round to oval, and are sometimes fimbriated. Schuffner's dots are visible under optimal conditions

A B C


A, B: Trophozoites of P. ovale in thin blood smears. A is slightly amoeboid. B shows a more compact trophozoite and Schuffner's dots.
C: Trophozoite in a thick blood smear


Plasmodium ovale: Schizonts

Smears from patients:
Plasmodium ovale schizonts have 6 to 14 merozoites with large nuclei, clustered around mass of dark-brown pigment. Red blood cells (RBCs) are normal to slightly enlarged (1 1/4 ?), may be round to oval, and are sometimes fimbriated. Schuffner's dots are visible under optimal conditions.

A B C D


A, B, C: Schizonts of P. ovale in thin blood smears. All of these infected blood cells are oval. A and C have minor fimbriation.
D: Schizont in a thick blood smear.


Plasmodium ovale: Gametocytes

Smears from patients:
Plasmodium ovale gametocytes are round to oval, and may almost fill the red blood cells (RBCs). Pigment is brown and more coarse than that of P. vivax. RBCs are normal to slightly enlarged (1 1/4 X), may be round to oval, and are sometimes fimbriated. Schuffner's dots are visible under optimal conditions.

A B C


A, B, C: Gametocytes in thin blood smears. The Schuffner's dots can be seen in the infected oval RBC in A, and the erythrocytes in B and C show fimbriation.

 

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