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J Virol. 1969 February; 3(2): 157-163
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Markers of Rubella Virus Strains in RK13 Cell Culture

Alice Fogel1 and Stanley A. Plotkin

The Wistar Institute of Anatomy and Biology, Philadelphia, Pennsylvania 19104

ABSTRACT

When tested on RK13 cell cultures, strains of rubella virus could be differentiated by their ability to form small or large plaques. Large plaques were produced by the HPV-77 and Cendehill strains, and also by a laboratory stock strain (West Point), after only 14 passages in RK13 culture. Five wild-type rubella viruses, isolated and passaged only a few times in African green monkey kidney tissue culture, grew well in RK13 cell culture, but they were sensitive to agar inhibitors and, therefore, formed small plaques. On the other hand, RA27/3, an attenuated strain grown in WI-38 human fibroblast cells, developed low titers in RK13 cells and also produced small plaques. We concluded that the morphological differences between small-plaque and large-plaque viruses depended on their sensitivity to agar inhibitors and on the pH of the medium during plaque formation.

FOOTNOTES

1 Present address: Ministry of Health, Virus Laboratory, Tel-Aviv-Yaffo, Israel.

J Virol. 1969 February; 3(2): 157-163
Copyright © 1969 American Society for Microbiology. All Rights Reserved.



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