When an organ is replaced with someone else’s, the body needs immunosuppressants because of the foreign object now in the body. Why is the same not true for a blood transfusion?

Question

Basically title! I was wondering about this. Thanks!

In: 144

Answer 1

The immune system recognizes blood cells as self and will not attack them.

The immune system recognizes blood cells as foreign because they contain antigens that differ from the patient’s own antigens.

The patient’s immune system is suppressed so that it will not attack the foreign blood cells.

The patient is given an antiserum that will attack the new blood cells.