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Appl Environ Microbiol. 1972 July; 24(1): 138-142
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Quantitative Assay of Paravaccinia Virus Based on Enumeration of Inclusion-Containing Cells

Department of Microbiology, University of Iowa, Iowa City, Iowa 52240

ABSTRACT

Bovine paravaccinia virus produces cytoplasmic inclusion bodies on infection of bovine embryonic kidney cells; these were easily recognized when stained with acridine orange or May-Grünwald-Giemsa stain. The inclusions could be shown to contain newly synthesized deoxyribonucleic acid by autoradiography. Counts of inclusion-containing cells decreased when virus suspensions were treated with immune serum before being used to inoculate cell cultures. At 24 hr after infection, the number of cells containing inclusions was directly proportional to the concentration of infectious virus inoculated. These observations provide the basis for a virus assay which is simpler, faster, and more sensitive than the plaque assay.