What prevents some people from getting malaria?

Partial immunity: People who live in endemic areas have often had multiple bouts of malaria, which gives them partial immunity. They can still get it again, but it might be less severe than in someone with no prior exposure, or someone whose last exposure occurred many years ago. That being said, malaria is still a very important cause of death in people who live in endemic areas, so there's no sure protection.

Prophylaxis/Sicklers: Malaria prophylaxis prevents many people who either live or are visitors in Malaria Endemic Areas or countries.And prevent mosquito bites by using mosquito repelents and sleeping in Mosquito proof beds.Also in some patients who suffer from Sickle Cell Disease the have a natural immunity that protects them against Malaria