Question

Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine?

Accepted Answer

Man does not develop immunity to malaria during natural infection

Answer

Malaria is caused by several species of Plasmodium

Answer

Vaccines can be developed only against bacteria.

Answer

Man is only an intermediate host and not the definitive host.