Taxonomy: f. Plasmodidae
Animal: Plasmodium vivax 2 11.jpg
Plasmodium vivax in thin film - note 2 young ring forms, rings are 1/3 size of red cell (unlike P.falciparum rings which are 1/6 size of the red cell) . Only young ring forms may be present in the blood in the early part of the cycle ie 0-12 hours in a 44-48 hour cycle so it may be difficult to diagnose. If there are very few rings, one can't exclude P.falciparum infection or a mixed infection, repeat blood examination 12 hours later may assist in diagnosis as older stages may be present then.
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