why is the carrier mosquito of malaria not affected by the disease?
Viruses are not pathogenic (harmful) to all organisms, some act as carriers with no ill effects. Malaria has evolved to be harmful to humans, but certain mosquitos (anopheles in particular) can provide a suitable habitat in their gut for the virus, or pass the virus along from human to human via blood. However, the virus has never mutated in such a way that it would harm the mosquitos.
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