Bombay blood group is a rare blood type in which the people have an H antigen deficiency. They can receive or donate blood only with other individuals with the same blood group.
A central repository of data on alloantibodies could spare patients who require transfusions from potentially fatal complications such as delayed hemolytic transfusion reactions.
The risk of infusion reaction goes up in those with higher baseline lymphocyte counts. The study covered in this summary was published as a preprint and has not yet been peer reviewed.