so, red blood cells of most african people do not express the duffy blood-group protein. now, the duffy blood-group protein is essentially necessary for plasmodium vivax to get into the red cell.
大多数非洲人的红细胞不表达达菲血型蛋白(duffyblood-groupprotein),而间日疟原虫进入红细胞是需要达菲血型蛋白的,因此,呈达菲-阴性(duffy-negative)的非洲人被认为对间日疟原虫有抵抗力。