If a drug is active against pre erythrocytic stage of the malaria parasite it will be useful as
High-Yield Explanation
(Ref KDT 6/e p782) Stage ---clinical use Preerythrocytic- Causal prophylaxis Erythrocytic-Clinical cure -Suppressive prophylaxis Exo-Erythrocytic: Radical cure Gametocytic Pevention of transmission