A lot more people in Africa would have been helped if crazy lady didn't lead the charge to eliminate DDT.
You know they still use DDT in countries outside the "western world", like in Africa, Asia and South America.
Mosquitoes and other insects were also starting to have some resistance issues to DDT in the 1970s.
And there are other chemistries that kill mosquitoes just fine.
Sometimes it due to a corrupt government not alloting money to killing mosquitoes in the poorer areas, a vaccine is going to have the same problem in these same countries.