Climate change is bringing malaria to new areas

When a small number of cases of locally transmitted malaria were found in the United States last year, it was a reminder that climate change is reviving or migrating the threat of some diseases. But across the African continent malaria has never left, killing or sickening millions of people.

Take Funmilayo Kotun, a 66-year-old resident of Makoko, an informal neighborhood in Nigeria's Lagos city. Its ponds of dirty water provide favorable breeding conditions for malariaspreading mosquitoes. Kotun can't afford insecticide-treated bed nets that cost between $7 and $21 each, much less antimalarial medications or treatment.

For World Malaria Day on Thursday, here is what you need to know about the situation in Africa:

Malaria is still widespread

The malaria parasite mostly spreads to people via infected mosquitoes and can cause symptoms including fever, headaches and chills. It mostly affects children under 5 and pregnant women. Vaccine efforts are still in early stages: Cameroon this year became the first country to routinely give children a new malaria vaccine, which is only about 30% effective and doesn't stop transmission.

A second vaccine was recently approved.

Cases of resistance to antimalarial drugs and insecticides are increasing, while funding by governments and donors for innovation is slowing.

Living conditions play a role, with crowded neighborhoods, stagnant water, poor sanitation and lack of access to treatment and prevention materials all issues in many areas. And an invasive species of mosquito previously seen mostly in India and the Persian Gulf is a new concern.

A growing problem

Globally, malaria cases are on the rise. Infections increased from 233 million in 2019 to 249 million in 85 countries in 2022. Malaria deaths rose from 576,000 in 2019 to 608,000 in 2022, according to the World Health Organization.

Of the 12 countries that carry about 70% of the global burden of malaria, 11 are in Africa and the other is India. Children under 5 constituted 80% of the 580,000 malaria deaths recorded in Africa in 2022.

COVID-19 hurt progress

The fight against malaria saw some progress in areas such as rapid diagnostic tests, vaccines and new bed nets meant to counter insecticide resistance, but the COVID-19 pandemic and a shift in focus and funding set back efforts.

A study published in Tropical Medicine and Infectious Disease last year said COVID-19-induced lockdowns led to disruptions at 30% of rural community health service points across Africa. Malaria cases started spiking again, breaking a downward trend between 2000 and 2019.

That downward trend could soon return, according to the WHO.