Virus quantification is done by -
Quantitative assays measure the actual number of infectious paicles in the inoculum. Two methods available-plaque assay and pock assay. REF:ANATHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 8TH EDITION PAGE NO:437
Egg inoculation
Hemadsorption
Plaque assay
Electron microscopy
Virology