Focus Reduction Neutralization Assay

**Semantic type:** Laboratory Procedure

**Definition:** An assay that is used to determine whether neutralizing antibodies that are present in a biological specimen can block viral infection/proliferation ex vivo, by counting the number of viral foci. This assay typically uses live virus.

**Synonyms:** - FOCUS REDUCTION NEUTRALIZATION ASSAY - FRNT - FRNT - Foci Reduction Neutralization Test - Foci Reduction Neutralization Test - Focus Reduction Neutralization Test - Focus Reduction Neutralization Test