Monoclonal antibodies and vaccinated animals are two sources of antibodies used in serological testing.
It is possible to modify the agglutination test to measure soluble antigens. The term "hemagglutination inhibition" refers to this test. Hemagglutination inhibition refers to the measurement of soluble antigen's capacity to prevent antibodies from adhering to antigen-coated red blood cells.
IgA is the primary class of antibody present in a variety of bodily fluids, including tears, saliva, respiratory, intestinal, and colostrum secretions. IgA levels in serum are quite low. B cells found in the body's mucous membranes create IgA.
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