There are a number of different stages in the life cycles of the protozoa that cause malaria, and they have differing microscopic appearance, antigenicity, and susceptibility to antimalarial medications. Malaria is a major hindrance to economic improvement in many countries. It is a leading serious infectious disease worldwide, and unless well-funded sustained control measures are undertaken, it is expected to advance into new geographic areas.
■ Why is malaria contracted from a blood transfusion easier to treat than if contracted from a mosquito?
■ Why did insecticide-resistant mosquitoes begin to appear?
■ Are sporozoites diploid or haploid?
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