Double chromatin dot forms description

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Early or late trophozoites where the chromatin dot has two separate masses - a double dot that is sometimes said to resemble a signet ring, although this really only applies for typical ring forms where dots are relatively close together.

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Note how the chromatin dot of the ring form is divided into two purple masses

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Species significance

Most often this appearance seen in infection with P.falciparum and can be helpful to indicate this species; however the form is not fully specific and may occur in any species.

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Additional images

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  A

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  B

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  C

Malaria double chromatin dot forms in: late trophozoite of P.ovale (A) an early trophozoite of P.vivax (B) and early trophozoite of P.knowlesi (C)