Is malaria treatment 100% effective?
NO
First of all, it must be specified that there is currently no vaccine to prevent malaria, which is the most deadly infectious disease in the world. There are various "prophylactic" (preventive) treatments to protect against malaria.
The choice of treatment depends on the traveller (contraindications, possible medicinal interactions, pregnant women, children, previous history, etc.) and the trip (areas passed through and visited, duration, season, altitude, accommodations, etc.). The parasite that causes the disease (Plasmodium falciparum) has developed resistances to existing treatments, which is why treatment is different depending on your destination and why it is not 100% effective.
Plasmodium Falciparum is the parasite responsible for malaria, and it is transmitted to us by the mosquito Anopheles when it bites us.