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Virology Division Bureau of Laboratories Center for Disease Control Public Health Service U.S. Department of Health, Education and Welfare, Atlanta, Georgia 30333, U.S.A.
The nucleocapsid structures of Tacaribe virus, a member of the Arenaviridae, were purified from detergent-treated virus particles by equilibrium density gradient centrifugation. Negative-contrast electron microscopy indicated that they were coiled, circular filaments. They had a mean diam. of 5 to 10 nm and two predominant length classes of 640 nm and 1300 nm were found.
Received 21 March 1977;
accepted 12 May 1977.
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