[HIGHLIGHTS] Call for rare blood groups: why are donors of African or Caribbean origin so sought after?

Blood groups A, B, AB or O and the Rhesus + or - character are called antigens. There are 390 other "markers" called "Bombay", "Vel negative" or "Rhesus null" These are not musical groups but rare blood, whose donors are essential to meet the diversity of needs around the world.

In France, between 700,000 and 1 million people carry rare blood. These people must receive blood as close as possible to their own as an incompatibility could cause their death.