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Q.

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

A Malaria is caused by several species of Plasmodium.
B Vaccines can be developed only against bacteria.
C Man does not develop immunity to malaria during natural infection.
D Man is only an intermediate host and not the definitive host.
Answer & Explanation
Option: [C]

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