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Polyclonal serum that contains demonstrable antibody or antibodies specific for one (monovalent or specific antiserum) or more (polyvalent antiserum) antigens; may be prepared from the blood of animals inoculated with an antigenic material or from the blood of animals and people who have been stimulated by natural contact with an antigen (as in those who recover from an attack of disease).
Synonym(s): immune serum
Antiserum containing antibodies specific for more than one antigen.
See also: antiserum