疟疾的成因是寄生在蚊子上的疟疾原虫，并经由蚊子叮咬后传染给人类。
Malaria is caused by a parasite that spends part of its life cycle inside the mosquito, and is passed along to humans by mosquito bites.
蚊子传播疟原虫，引发疟疾，是一种致死性强的世界性疾病。
Mosquitoes transmit the parasite, Plasmodium, that causes malaria, one the deadliest diseases on Earth.
疟疾是由称为疟原虫的一种单细胞寄生虫造成的。
Malaria is caused by a one-celled parasite called a Plasmodium.
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