French researchers have identified a new blood group that currently exists in only one person worldwide – a woman from Guadeloupe. The discovery, officially recognized in early June 2025 by the International Society of Blood Transfusion (ISBT), marks the 48th known blood group system in humans. The French Blood Establishment (EFS) announced this breakthrough after years of research spanning more than a decade. The blood group, named “Gwada negative,” reflects both the patient’s Guadeloupean origin and the absence of a specific antigen on her red blood cells. “Today only she is compatible with herself in the whole world,” explained Thierry … Continue reading French Scientists Discover 48th Blood Group System: Woman Has Blood Compatible Only With Herself