A 65-year-old man in India's western state of Gujarat who suffers from heart disease was discovered to have the rare blood type EMM negative, which cannot be classified into the four other blood types (A, B, O, or AB). The human body contains 42 different types of blood systems, including A, B, O, Rh, and Duffy. In general, there are four different blood group types. EMM is also present in high amounts in 375 different types of antigens.