What is the newly discovered blood type B(A)?

The newly discovered B(A) blood type is characterized by mostly B antigens with trace A antigens, found in only three known individuals.

Where was the new blood type B(A) discovered?

The new blood type B(A) was discovered by researchers in a Thai hospital in 2025.

How does the B(A) blood type differ from the ABO system?

The B(A) blood type differs from the ABO system by having predominantly B antigens with trace A antigens, and its discovery highlights blood typing's complexity beyond basic ABO.

Home / Science / Rare Blood Type B(A) Found in Only Three Individuals

Rare Blood Type B(A) Found in Only Three Individuals

27 Apr

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Summary

A new blood type, B(A), has been discovered in three individuals.
This type has mostly B antigens with trace amounts of A antigens.
The discovery highlights the complexity of blood typing beyond ABO.

Rare Blood Type B(A) Found in Only Three Individuals

In 2025, researchers identified a new blood type, B(A), present in only three known individuals. This rare type was discovered in a Thai hospital and is characterized by predominantly B antigens with trace amounts of A antigens. This finding adds to the 48 previously known human blood types, emphasizing the complexity of blood classification.

The discovery in Thailand marks the first time such a phenomenon has been recorded in the Thai population, despite similar genetic alterations being previously observed in other ethnicities. Researchers noted distinct ABO discrepancies between donors and patients, influenced by patient conditions and therapy.