Bombay Blood Group (HH Blood Group) – A Rare Blood Type Discovery and Origin First discovered in Mumbai (Bombay), India, in 1952 by Dr. Y.M. Bhende. Extremely rare, found in 1 in a million people worldwide , but more common in India (1 in 10,000 people) due to consanguineous marriages. Unique Characteristics Individuals with this blood group lack the H antigen , which is the precursor for the A and B antigens in the ABO blood system. Contains anti-A, anti-B, and anti-H antibodies , making it incompatible with all ABO blood types. Can only receive blood from another Bombay blood group donor. Clinical Significance Blood Transfusion Challenge: People with this blood group cannot receive O, A, B, or AB blood , as even O blood contains the H antigen. Rare Donor Availability: Since the blood group is rare, finding a matching donor for transfusions is difficult. High Risk in Emergencies: Requires special blood banking and donor registration to facilitate emergency transfusions. Inherita...