The peripheral blood smear shows a schizont form of the parasite, although any malarial stage (gametocyte, schizont, trophozoite, or ring) can be seen on a smear and is diagnostic of infection. CHLOROQUINE effectively eradicates circulating forms if there is no resistance but has NO EFFECT ON THE HYPNOZOITE EXOERYTHROCYTIC forms of P Vivax and P ovale. Addition of PRIMAQUINE effectively treats these liver forms and prevents relapsing infection.