What!? Recolonisation? What a stupid thing to say. That's like solving someone's money problem by giving them cheap credits they can never return. Or solving thirst by drinking sea water. Colonisation leads to conflict, which leads to Decolonisation, which returns them back where they started only they wasted both just time and sometimes people's lives.
Want to help them? Look at their native populace and find outliers (people that have least amount of malaria), then analyze what these people do that reduces their contact with malaria, and spread those methods to other people. If those methods are successful spread them, if not go back to start of paragraph. Rinse, repeat.
Since you speak English, you were almost certainly born in a colonised country. Yes, it can indeed go badly. And if you had thought for 10 seconds before typing your outraged reply, you can probably think of a few cases where it has gone well.
Ironically, your "solution" requires either being, or having the cooperation of, the government in the affected territory, so you're actually agreeing with me.
You seem to be using a different definition of colonization of state than what I considered nominal i.e. maintaining power structures that are closely aligned to the colonizing force or transferring people to create such power structures. Of the top my head, I can't name a single one, I can however name several botched attempts at colonization.
My "solution" doesn't require much cooperation, other than having a NGO and government tolerance of such NGO. IF NGO count as colonization than colonization is pretty meaningless.
Want to help them? Look at their native populace and find outliers (people that have least amount of malaria), then analyze what these people do that reduces their contact with malaria, and spread those methods to other people. If those methods are successful spread them, if not go back to start of paragraph. Rinse, repeat.