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Question
Why has effectively combating the spread of malaria become more challenging since the 1970s?
a. Anti-malarial drugs cost too much to be used widely in the less-developed countries where malaria infections are widespread.
b. During this century, the average atmospheric temperature had risen, thus causing populations of malaria-carrying mosquitoes to spread from tropical areas to warmer temperate areas of the earth.
c. The vaccine that can prevent this disease is expensive.
d. The parasite infects and destroys its victims red blood cells, causing intense fever, chills, drenching sweats, severe abdominal pain, vomiting, headaches, and increased susceptibility to other diseases.
e. Most species of the Anopheles mosquito have become genetically resistant to most insecticides and the Plasmodium parasites have become genetically resistant to common antimalarial drugs.
Answer
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