Plaque Reduction Neutralization Test — PRNT

The Plaque Reduction Neutralization Test (PRNT) is a quantitative cell-based serological assay used in veterinary and human virology to measure the ability of antibodies in a serum sample to neutralize a live virus. By counting visible plaques — areas of cell destruction on a monolayer — the method determines the serum titer at which viral infectivity is reduced by 50% or 90%, making it the gold-standard technique for detecting and quantifying neutralizing antibodies against many RNA and DNA viruses.