Double chromatin dot forms

---

What is a double dot form?

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.

• 

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

---

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.

---

Additional images

• 

  A

• 

  B

• 

  C

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

---