A MUST READ If You Have Rh-Negative Blood The Mystery of Rh-Negative Blood—Genetic Origin Unknown BLOOD GROUPS – General Overview Posted by Nella Adriana Čorak-Šebetić  Nearly 85% of all human beings have RH positive blood. Which merely indicates that their red blood cells contain a substance called the RHesus (rhesus) blood factor. Simply put, … Continue reading A MUST READ If You Have Rh-Negative Blood