mind & bodyanalysisOur World in Data2021 · Sub-Saharan Africa

Malaria is the leading killer of children under five in more than 20 African countries

the gist

Malaria is caused by Plasmodium parasites carried by female Anopheles mosquitoes, which spread them when they bite. In 2021 it was the top cause of death among children under five in more than 20 countries in Sub-Saharan Africa, even though it is both preventable and treatable. Young children are especially vulnerable because they have not yet built up partial immunity, so a fever can quickly become severe anaemia, seizures or cerebral malaria. Bed nets treated with insecticide, indoor spraying, and fast diagnosis with antimalarial drugs prevent most of these deaths. The gap between what works and what reaches children is the core of the problem.

how it works

Malaria parasites enter the bloodstream through a mosquito bite, travel to the liver, then invade red blood cells, where they multiply and burst them out in cycles. Each cycle causes fever and anaemia, and the parasite can block small blood vessels in the brain or other organs. Insecticide-treated nets kill or deter the mosquitoes that bite people at night, which is when they most often feed.

so what

Malaria shows that a disease can remain the biggest threat to young children even when cheap tools already exist. Its toll depends less on medical science than on delivery: getting nets, testing and treatment to families in time.

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