An individual with blood type O receives type A blood. The phenomenon is agglutination.

Can explain more?

Since this is not my area of expertise, I searched Google under the key words "agglutination blood" to get these possible sources:

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RBC's of type O do not have surfarce antigens; in the blood of this individual will be naturally occuring antibodies to A type antigens on RBC's of the donor. Reaction between anti-A antobodies with A antigens in the donor's blood will cause type II hypersensitivity reaction leading to RBC (red blood cell) lysis.

Certainly! The phenomenon you mentioned is known as agglutination. In the context of blood transfusions, agglutination occurs when there is an incompatible match between the blood types of the donor and the recipient.

In the ABO blood typing system, there are four major blood types: A, B, AB, and O. Each blood type is determined by the presence or absence of specific antigens on the surface of red blood cells. Antibodies, which are part of the body's immune system, are also present in the blood and react with these antigens.

In the scenario you described, an individual with blood type O is the recipient and receives blood type A. This is an incompatible match because people with blood type O have both anti-A and anti-B antibodies in their blood. When type A blood is introduced, the anti-A antibodies in the recipient's blood will react with the A antigens present on the donor's red blood cells.

This immune reaction causes the red blood cells to clump together or agglutinate. Agglutination can be dangerous as it can lead to blockage of blood vessels, destruction of red blood cells, and other complications that may be life-threatening. Therefore, it is essential to ensure compatibility between the blood types of the donor and the recipient before performing a blood transfusion.

To prevent agglutination and ensure a successful transfusion, blood types must be tested before transfusion by conducting a blood typing test. This involves mixing the potential donor's blood with specific reagents and observing for agglutination reactions. If agglutination occurs, that blood type is incompatible with the recipient's blood type, and an alternative donor must be identified.