AIDS in Africa.

HIV has infected more than 10 million people in sub-Saharan Africa with prevalence rates of up to 30% reported from some countries. Adult transmission of HIV in Africa is mainly heterosexual and over half of new infections are in women. About 40% of infants born to HIV-positive mothers are themselves infected. Diarrhoea occurs in 90% of African AIDS patients and 'slim disease' (prolonged diarrhoea and wasting usually due to coccidian parasites) is pathognomic of AIDS in Central Africa. Dual infection with HIV and tuberculosis is a major problem. African AIDS patients appear to succumb to virulent pathogens, especially Mycobacterium tuberculosis, before they become sufficiently immunosuppressed to develop the opportunistic infections typically associated with advanced HIV disease in developed countries.