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[Plasmodium falciparum] [Plasmodium knowlesi] [Plasmodium malariae] [Plasmodium ovale] [Plasmodium vivax]

Ring-form trophozoites of P. vivax usually have a thick cytoplasm with a single, large chromatin dot.  Rings may be difficult to distinguish from those of P. ovale.  The cytoplasm becomes amoeboid and Schüffner's dots may appear as the trophozoites mature.  Infected RBCs are often larger than uninfected RBCs.  Multiply-infected RBCs are not uncommon.

A	B

A, B: Ring-form trophozoites of P. vivax in a thick blood smear.