Anamnestic response involves a more rapid synthesis and greatly increased titer of antibody when the immune system is subsequently exposed to the same antigen.
The anamnestic response is an immune system property that allows vaccine development. As a result of B-lymphocytes recognizing T-dependent antigens (proteins) during humoral immunity, a large number of circulating B-memory cells and T4-memory cells with anamnestic response or memory develop.
Alloimmunity (also known as isoimmunity) is an immune response to nonself antigens from members of the same species. These antigens are known as alloantigens or isoantigens. Blood group antigens and histocompatibility antigens are the two main types of alloantigens.
An anamnestic response to antigens on transfused red blood cells causes a delayed hemolytic transfusion reaction that occurs 7 to 10 days after the transfusion and is a well-documented complication of red cell transfusion in humans.
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