For several years independent researchers at various US universities have had unfettered access to GMO seed stock. The studies I referenced in an earlier comment were conducted by researchers at the Universities of Nebraska and Georgia, both of which state that, based on their intensive, independent research there are no known concerns with GMO food.
The Internet is full of nonsense; GMOs and vaccines are both targeted by a lot of people who don't have bona fides, such as the former yoga instructor who is leading the charge against GMOs in the US. A University of Ga. researcher has stated that a few very badly conducted studies exist that state GMOs cause problems, but there are several thousand well researched studies showing no problems.
That Africa would ban GMOs is hardly surprising; they killed a number of medical professionals giving vaccines a few months ago based on their superstitions. And countries that do not have their own GMOs have a vested interest in banning GMOs, such as to protect their own seed stock sales.
The best research on this topic finds no concerns with GMOs. But the hysteria surrounding it has a life of its own, just like the anti-vaxxers.