<Ol> <Li> The clumping of cells such as bacteria or red blood cells in the presence of an antibody or complement . The antibody or other molecule binds multiple particles and joins them, creating a large complex . This increases the efficacy of microbial elimination by phagocytosis as large clumps of bacteria can be eliminated in one pass, versus the elimination of single microbial antigens . </Li> <Li> When people are given blood transfusions of the wrong blood group, the antibodies react with the incorrectly transfused blood group and as a result, the erythrocytes clump up and stick together causing them to agglutinate . The coalescing of small particles that are suspended in a solution; these larger masses are then (usually) precipitated . </Li> </Ol> <Li> The clumping of cells such as bacteria or red blood cells in the presence of an antibody or complement . The antibody or other molecule binds multiple particles and joins them, creating a large complex . This increases the efficacy of microbial elimination by phagocytosis as large clumps of bacteria can be eliminated in one pass, versus the elimination of single microbial antigens . </Li> <Li> When people are given blood transfusions of the wrong blood group, the antibodies react with the incorrectly transfused blood group and as a result, the erythrocytes clump up and stick together causing them to agglutinate . The coalescing of small particles that are suspended in a solution; these larger masses are then (usually) precipitated . </Li> <P> Hemagglutination is the process by which red blood cells agglutinate, meaning clump or clog . The agglutin involved in hemagglutination is called hemagglutinin . </P>

When does clumping occur during a blood transfusion