Functional Baculovirus Particle Quantification via Plaque Assay.

Plaque assay method enables the quantification of infectious baculovirus when defined as plaque forming units (PFU). It allows to determine the amount of infectious virus needed to infect the cells at a specific multiplicity of infection (MOI). Serial dilutions of baculovirus stock are added to the Sf9 cells monolayer followed by addition of 5% Agarose overlay. Six days after infection clear infection halos are observed using a neutral red solution. Here we describe the quantification of recombinant baculovirus expression vector (rBEV) carrying a transgene in an rAAV expression cassette. Reproducible quantification of PFU is obtained with this method.