Antiserum
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Antiserum (plural: antisera) is blood serum containing antibodies. Antiserum is used to pass on passive immunity to many diseases.
[edit] How it works
Antiserum determines the antibody level or trail filtration by the performance of taking blood sample from a laboratory animal. The blood is allowed to clot, then the serum is removed for testing. Once the antibody concentration reaches a desired level, the animal is bled. Immune serum obtained should contain antibodies produced in response to the immunogenic stimulus. These antibodies are capable of binding with the antigenic determinant (epitope) that had caused their formation in some manner.