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. 1966 May;91(5):1977–1985. doi: 10.1128/jb.91.5.1977-1985.1966

Yaba Tumor Poxvirus Synthesis In Vitro I. Cytopathological, Histochemical, and Immunofluorescent Studies

David S Yohn 1, Victoria A Haendiges 1, James T Grace Jr 1
PMCID: PMC316154  PMID: 4287080

Abstract

Yohn, David S. (Roswell Park Memorial Institute, Buffalo, N.Y.), Victoria A. Haendiges, and James T. Grace, Jr. Yaba tumor poxvirus synthesis in vitro. I. Cytopathological, histochemical, and immunofluorescent studies. J. Bacteriol. 91:1977–1985. 1966.—Yaba tumor poxvirus synthesis in BSC-1 cell culture was followed sequentially with light microscopy, immunofluorescent microscopy, and various histochemical stains. The first evidence of infection was detected at 24 hr when nucleoli became hypertrophic, reflecting enhanced ribonucleic acid (RNA) synthesis. At 36 hr, deoxyribonucleic acid synthesis was detected in the cytoplasm. This was immediately followed by or associated with antigen synthesis at paranuclear sites and enhanced RNA synthesis in the cytoplasm. Cytoplasmic inclusions were readily apparent at 4 days in initially infected cells. Contiguous spread of virus was judged to have occurred around the third day of infection. The time required to complete the synthetic cycle from time of infection to production of infectious progeny was estimated to be of the order of 60 hr. This cycle is 6 to 10 times longer than for vaccinia virus. By light microscopy, cytopathic effects (CPE) were detectable in 5 days in heavily infected cultures. With 100 units or less of infectious virus, CPE was not readily detected until the 10th to 14th day. At this time, focal areas of infection classified either as microtumors or microplaques were present. Secondary foci appeared during the 4th week of incubation.

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Selected References

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