| duffy blood types and vivax malaria in ethiopia. | we investigated an hypothesis relating the duffy-negative blood type with insusceptibility to vivax malaria--and previously associated only with people of west african ancestry--in three population samples of eastern african stock. the samples included nilotic and hamitic-semitic residents of a malarious locale in ethiopia and hamito-semites in addis ababa where malaria is not endemic. fresh red blood cells from 191 subjects were tested with duffy antisera, anti-fya and anti-fyb. duffy-positive ... | 1981 | 7015888 |