Asked Feb 10, 2019

Explain why an rh negative person does not have a transfusion reaction after the first exposure to the positive blood, but does have a reaction after the second exposure.


Expert Answer

Step 1

Rhesus (Rh) factor is a blood protein that is found on the surface of the red blood cells. Presence of this Rh factor in the blood makes a person Rh positive, and people without this Rh factor in the blood are Rh negative. 

Step 2

All blood has the same components but not all blood is the same. People have different blood types depending on the presence or absence of antigens on the red blood cells. Again, blood can be either Rh positive or Rh negative. If a person with Rh negative blood is given Rh positive blood, a transfusion reaction  may occur. But the reaction does not tak...

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