Lewis Smith Lake (or Smith Lake) is located in North-Central Alabama about 20 miles northwest of Birmingham in state of Alabama (U.S.) counties of Cullman, Walker and Winston. The 300-foot high dam, completed in 1961 by Alabama Power Company, impounds the Sipsey Fork of the Black Warrior River to form the lake.
Because the malaria species Plasmodium vivax normally uses DARC to enter red blood cells, people who carry this mutation are resistant to one strain of malaria. This particular strain of malaria is not a major killer in Africa today, but was likely more threatening in the past. Biologists reason that the DARC mutant arose in Africa through random mutation and began to spread through the process of natural selection.
Today the region continues to be the epicentre of the HIV/AIDS epidemic, with 48 per cent of the worldâs new HIV infections among adults, 55 per cent among children, and 48 per cent of AIDS-related deaths [1]. The Southern Africa sub-region, in particular, experiences the most severe HIV epidemics in the world.Nine countries-Botswana, Lesotho, Malawi, Mozambique, Namibia, South Africa, Swaziland, Zambia and Zimbabwe-have adult HIV prevalence rates of over 10 per cent.oday the region continues to be the epicentre of the HIV/AIDS epidemic, with 48 per cent of the worldâs new HIV infections among adults, 55 per cent among children, and 48 per cent of AIDS-related deaths [1]. The Southern Africa sub-region, in particular, experiences the most severe HIV epidemics in the world.