Taxonomy: f. Plasmodidae
Animal: Plasmodium vivax 2 12.jpg
Plasmodium vivax in thin film - note ring on edge of red cell. Applique forms are more common with P.falciparum but can occur with P.vivax infections. It is best to make the smears from native blood (ie. without anti-coagulant) as anticoagulant can distort the parasites and displacement of the parasite can also occur during spreading of the blood. These forms can also occur if the patient has started mepacrine treatment. Further examination to find more characteristic forms of the parasite was necessary before a diagnosis could be made for this patient. 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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