This protocol shows an accurate and objective approach to visualize viral titrations using crystal violet, by comparing it with optical microscopy and immunocytochemical staining.
Frias-De-Diego, A., Crisci, E. Use of Crystal Violet to Improve Visual Cytopathic Effect-based Reading for Viral Titration using TCID50 Assays. J. Vis. Exp. (180), e63063, doi:10.3791/63063 (2022).