Collecting blood from patients who have recovered from a contagious disease in order to treat other patients suffering from the same disease or to protect healthy individuals from this disease is an ancestral practice.
Ukusanyaji wa damu kutoka kwa wagonjwa ambao walipona kutokana na ugonjwa wa kuambukizana ili kutibu wagonjwa wengine wanaougua kutokana na ugonjwa sawa au kulinda wahudumu wa afya kupata ugonjwa una historia ndefu.