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Plasmodium vivax: Ring Stage Parasites

Smears from patients:
Plasmodium vivax rings have large chromatin dots and show amoeboid cytoplasm as they develop. Red blood cells (RBCs) can be normal to enlarged (1 1/2 x) and may be distorted. Under optimal conditions, Schuffner's dots may be seen.

A B C


A, B, C: Rings in thin blood smears. A and C: Rings are amoeboid; RBCs are enlarged and distorted. B: Ring with double chromatin dot. Schuffner's dots can be seen in B and C.


Plasmodium vivax: Trophozoites

Smears from patients:
Plasmodium vivax trophozoites show amoeboid cytoplasm, large chromatin dots, and have fine, yellowish-brown pigment. Red blood cells are enlarged 1 1/2 to 2 X and may be distorted. Under optimal conditions, Schuffner's dots may appear more fine than those seen in P. ovale.

A B C


A, B, C: Large, amoeboid trophozoites of P. vivax in thin blood smears.


Plasmodium vivax: Schizonts

Smears from patients:
Plasmodium vivax schizonts are large, have 12 to 24 merozoites, yellowish-brown, coalesced pigment, and may fill the red blood cell (RBC). RBCs are enlarged 1 1/2 to 2 ? and may be distorted. Under optimal conditions, Schuffner's dots may be seen.

 
A B  
C D E


A, B: Mature schizonts.
C, D, E: Ruptured schizonts.


Plasmodium vivax: Gametocytes

Smears from patients:
Plasmodium vivax gametocytes are round to oval with scattered brown pigment and may almost fill the red blood cell (RBC). RBCs are enlarged 1 1/2 to 2 x and may be distorted. Under optimal conditions, Schuffner's dots may appear more fine than those seen in P. ovale.

A B C


A, B, C: Gametocytes of P. vivax in thin blood smears. Schuffner's dots can be seen in B and C.

 

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