Leishmania is a protozoal parasite are transmitted by the bite of infected female sandflies. they are then phagocytized and live within host leukocytes. which type of cell is most likely to harbor them?

Macrophages is the answer

The answer is macrophages. They either actively invade these leukocytes or are phagocytosed, divide in the cells and cause lysis. The promastigotes that invade these leucocytes are transformed into amastigotes in the macrophages. These amastigotes continue attacking other healthy macrophages while others migrate to the mid gut.