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Science 22 January 1965:
Vol. 147. no. 3656, pp. 408 - 409
DOI: 10.1126/science.147.3656.408
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Articles

Simian Virus 40: Isolation of Two Plaque Types

John L. Riggs 1 and Edwin H. Lennette 1

1 Viral and Rickettsial Disease Laboratory, California State Department of Public Health, Berkeley 4

Two different morphological plaque types of simian virus 40 were isolated from three of six strains. Increased uptake of neutral red gave one type of plaque a uniform red appearance, whereas the center of the other remained unstained. The viruses showed stability of plaque morphology on passage in tissue culture; cross neutralization studies identified both as simian virus 40.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)