if the mosquito bites a person who has malaria, it picks up the parasite as it sucks the human blood.
the parasite matures inside the mosquito and is passed on to another human when the mosquite bites again.
malaria causes fever and shivering fits.
it is not necessarily a killer in itself, but it weakens the infected people so that they cannot work very hard.
they gradually become weaker and more likely to fall victim to other diseases.