"Such suppression of blood group antigens, with associated antibody production against the suppressed antigen, is an established phenomenon, seen for example in Kell, Kidd and LW systems.

About 80 percent of people secrete blood group antigens in other bodily fluids, such as saliva, mucus, and sweat. This group of people is referred to as secretors.

The majority of the 342 blood-group antigens belong to one of these systems. The Rh system (formerly known as “Rhesus”) is the largest, containing 61 antigens.

Study: Akkermansia muciniphila exoglycosidases target extended blood group antigens to generate ABO-universal blood.Image Credit: Kateryna Kon / Shutterstock. The study and findings. In the ...