Abstract
A simple tissue microculture technique was developed for the titration of a cytoplasmic polyhedrosis virus (CPV) from Euxoa scandens. The procedure was similar to the 50% tissue culture infectious dose assay, but a single infected cell, detected by the presence of cytoplasmic polyhedra, was scored rather than the degeneration of cell monolayers. The filtration of CPV suspensions resulted in decreased virus titers under certain conditions. This microculture assay was used to determine the effect of cell disruption methods on virus yields. Sonication of infected cells was more efficient than freeze-thawing for the recovery of nonoccluded virus.
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