They have bigger things to worry about. The place is a hell hole of everything that those who ignore it prefer to blame white people for.
Or it could just be the anti malarial drugs they were taking.
Decades of evidence alleged immunization campaigns were vehicles for sterilizing childbearing age African women, with similar history of assault on South American women.
Sick, evil bastards to say something like this. Smallpox, sleeping sickness, polio, and the other deadly diseases would still be rampant were it not for our generosity. The fertility rates disprove this vile lie.