During the last decade, research has indicated an important geographical link between regions of selenium deficient soils and peak incidences of HIV/AIDS infection. AIDS disease appears to involve a slow and progressive decline in levels of the trace element selenium (Se) in the blood along with CD4 cells, which are both independent predictors of mortality.
Senegal in West Africa has the lowest numbers of AIDS prevalence at 1.77% in the general population, and 0.5% in antenatal clinic attendees along with the highest levels of selenium-enriched soil.
Geologically, Senegal is situated in the desiccated or dried up Cretaceous and early Eocene Sea, and the land is formed from sedimentary rocks from dissolved minerals in the evaporating seawater. Consequently, calcium phosphates are one of the country’s mined mineral products used for fertilizers, and are derived from the selenium rich phosphorite. Senegal can also claim the lowest level of cancers on the African continent.