There is no doubt that HIV infection rates have fallen dramatically. Everyone in Africa is positive.
Do you think its appropriate to think this is true?
It's common knowledge, you can find many articles on the internet. Also I know it from personal experience living with 4 africans.
There is irrefutable proof that not all Africans have HIV if you bother to look at reputable sources. Saying all Africans have HIV is misleading and insulting. Conduct proper research and branch out of whatever misleading sources you've found to actually find the truth.