Fifty Percent Plaque Reduction Neutralization Endpoint Titer

**Semantic type:** Quantitative Concept

**Definition:** The reciprocal of the highest sample dilution level that results in a 50% or greater reduction in the formation of viral plaques. This should be reported as a titer from a plaque reduction neutralization assay.

**Synonyms:** - 50% PLAQUE REDUCTION NEUTRALIZATION TITER - 50% Plaque Reduction Neutralization Titer - PRNT50