Plasmodium falciparum
The most lethal human malaria parasite species, now surging fourfold on the French island of Mayotte.
Last refreshed: 9 June 2026 · Appears in 1 active topic
Why is the world's deadliest malaria parasite now surging on a French island?
Timeline for Plasmodium falciparum
Malaria surges fourfold on a French island
Pandemics and Biosecurity- Why has malaria surged fourfold in Mayotte in 2026?
- ECDC recorded 171 Plasmodium falciparum cases in Mayotte from January to 21 May 2026, with 63 locally acquired. Incidence averaged 25 cases per week in late April and early May against just 6 per week the year before, a 4.2-fold rise concentrated in southern municipalities.Source: ECDC CDTR Week 23
- What is Plasmodium falciparum and why is it the most dangerous malaria parasite?
- Plasmodium falciparum is the most lethal of five human malaria species, responsible for most malaria deaths globally. It can cause cerebral malaria and severe anaemia; untreated severe cases carry a mortality rate above 20%.Source: ECDC CDTR Week 23
- Can malaria from Mayotte spread to mainland France?
- ECDC rates the risk of Onward P. falciparum transmission to mainland Europe as very low. Malaria requires the Anopheles mosquito vector to spread; competent Anopheles species are not established in metropolitan France.Source: ECDC CDTR Week 23
- Should I take malaria tablets before travelling to Mayotte?
- Yes. ECDC advises travellers to Mayotte to consider antimalarial prophylaxis. Mayotte sits within the Indian Ocean transmission zone and recorded 171 P. falciparum cases in the first five months of 2026, including locally acquired infections.Source: ECDC CDTR Week 23
Background
ECDC recorded 171 cases of Plasmodium falciparum malaria in Mayotte from January to 21 May 2026, of which 63 were autochthonous (locally acquired rather than imported from travellers). Weekly incidence surged to an average of 25 cases per week in weeks 18 to 20 against 6 per week the prior year, a 4.2-fold rise concentrated in the southern municipalities, particularly Chirongui. ECDC rates the likelihood of Onward transmission to mainland Europe as very low. Travellers to Mayotte are advised to consider prophylaxis.
Plasmodium falciparum is the most lethal of the five human malaria parasite species and is responsible for the vast majority of malaria deaths worldwide. Unlike P. vivax, it can cause cerebral malaria and severe anaemia, with untreated severe cases carrying a mortality rate above 20%. It is transmitted by Anopheles mosquitoes and, unlike P. vivax, does not form dormant liver stages (hypnozoites), meaning all active transmission is via the mosquito vector. The parasite has developed resistance to multiple drug classes; artemisinin-based combination therapies (ACTs) remain the front-line treatment.
Mayotte sits within the Indian Ocean malaria transmission zone, bordering the Comoros archipelago, and has never been fully free of P. falciparum transmission. The 63 autochthonous cases in 2026 signal active local parasite circulation, not merely imported cases arriving with travellers. The longer-run concern is that warming and wetter conditions in the Indian Ocean expand the range and breeding season of the Anopheles vector, potentially deepening endemic transmission on French-administered territory.