Could you tell me what are several reasons why aids has spread so rapidly in africa and killed so many people?

AIDS in Africa: Aids is a big problem in certain parts of africa because it has become common in areas where there is a high rate of unprotected sex, low education rates and a large number of undiagnosed individuals. Several african countries are seeing a substantial degrees in the incidence of HIV infection whereas there are other parts of the world where it is increasing. So many are working on this.