The correct answer is A. Tropical areas.
Malaria is a mosquito-borne infectious disease of humans caused by protozoan parasites of the genus Plasmodium. The disease is widespread in tropical and subtropical regions in a belt around the equator, where more than 90% of malaria cases occur.
The four Plasmodium species that cause malaria in humans are Plasmodium falciparum, Plasmodium vivax, Plasmodium ovale, and Plasmodium malariae. Plasmodium falciparum is the most dangerous species, causing the most severe disease and the highest number of deaths.
Malaria is transmitted to humans through the bite of an infected female Anopheles mosquito. The mosquito bites a person and injects saliva into the wound. The saliva contains sporozoites, which are the infective form of the
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