Malaria is caused by the plasmodium parasite. The parasite is spread to humans through the bites of infected mosquitoes.
Types of plasmodium parasite
Only 5 types of plasmodium parasite cause malaria in humans.
Plasmodium falciparum
This is mainly found in Africa. It's the most common type of malaria parasite and is responsible for most malaria deaths.
Plasmodium vivax
This is mainly found in Asia and South America. It causes milder symptoms than Plasmodium falciparum. But it can stay in the liver for up to 3 years. This can mean the symptoms come back.
Plasmodium ovale
This is uncommon and found in West Africa. It can stay in your liver for several years without causing symptoms.
Plasmodium malariae
This is rare and usually only found in Africa.
Plasmodium knowlesi
This is rare and found in parts of southeast Asia.
How malaria spreads
The plasmodium parasite is spread by mosquitoes that mainly bite between sunrise and sunset.
Malaria cannot be directly spread from person to person. If a mosquito bites a person already infected with malaria, the mosquito can also become infected. It can then spread the parasite to other people.
Malaria can also spread through:
- blood transfusions
- sharing needles
But this is very rare.
Content supplied by the NHS and adapted for Ireland by the HSE