A study carried out in Fulani, a West African ethnic group with low susceptibility to malaria, reported that this population’s PBMCs express higher amounts of RNA for several Th1 and Th2 related genes but gene expression of FOXP3 and cytotoxic T lymphocyte antigen 4 (CTLA4) was markedly lower [28]. This evidence concerns the gene CTLA4 and malaria.