Mansonella perstans microfilariae

Microfilariae of Mansonella perstans are unsheathed and measure 190 to 200 micrometers in stained blood smears and 180 to 225 micrometers in 2% formalin. The tail is blunt, and nuclei extend to the tip of the tail. Microfilariae circulate in the blood.
(A) Microfilariae of M. perstans in a thick blood smear stained with Giemsa from a patient from Cameroon.
(B) Microfilaria of M. perstans in a thin blood smear from the same specimen as (A).