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Medical Definition of Neutralization tests
1. Titration of an antiserum by testing a series of dilutions of virus or immune serum to a given end-point, which is generally the dilution at which tissue cultures inoculated with the serum-virus mixtures demonstrate cytopathology (cpe) or the dilution at which 50% of test animals injected with serum-virus mixtures show infectivity (id50) or die (ld50). (12 Dec 1998)