I've done a lot of work in a variety of countries on the African continent. You'll run across a large variety of power plug types given how many different types of construction exist over there. I've seen US-plugs in quonset huts and all varieties of European plugs as well. I suggest you take a complete set of adapter heads with you or better yet.....
FAR more important, in my opinion, is that you take a surge protector. Given how many generators are in use for power in Africa, regulated power is a luxury in many areas and spikes are very common. I've watched my colleagues laptops totally fry due to power spikes while mine just tripped my surge protector. My personal suggestion is that you go and get one of these:
Lots of companies make that same model and I've used it in over 80 countries. The plug adapters are all built-in and you just have to 'dial up' the right pin arrangement from the device itself.
I also carry a very small travel surge protector with me to use with it so I can plug in more than one device at a time....just be sure to observe the limits. I use this one from Targus, but there are several others out there as well.