Question

how has AIDS impacted Africa

Answer 1

Between 1999 and 2000 more people died of AIDS in Africa than in all the wars on the continent, as mentioned by the UN Secretary General, Kofi Annan.

The death toll is expected to have a severe impact on many economies in the region. In some nations, it is already being felt. Life expectancies in some nations is already decreasing rapidly, while mortality rates are increasing.
[2000] began with 24 million Africans infected with the virus. In the absence of a medical miracle, nearly all will die before 2010. Each day, 6,000 Africans die from AIDS. Each day, an additional 11,000 are infected.

for 2008 (which are latest figures available) there were roughly:

33.4 million living with HIV
2.7 million new infections of HIV
2 million deaths from AIDS
Approximately 7 out of 10 deaths for 2008 were in Sub-Saharan Africa, a region that also has over two-thirds of adult HIV cases and over 90% of new HIV infections amongst children.
AIDS affects different segments of society in different ways. For example, children may have to care for an ill parent. Schooling may suffer as a result. Other times, children become orphans as parents succumb to AIDS. If they are lucky, children may have grandparents or relatives to help who then face the burden of raising many children, as the London-based organization, Panos, highlights:

Answer 2

http://www.globalissues.org/article/90/aids-in-africa