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EM of a plasmavirus
Virus classification
Group: Group I (dsDNA)
Order: Unassigned
Family: Plasmaviridae

Plasmaviridae is a family of bacteriophages, viruses that infect bacteria. Virions have an envelope, a nucleoprotein complex, and a capsid. They are 50–125 nm in diameter with a baggy or loose membrane. All species known in this family have been isolated from species in the class Mollicutes.

This family is poorly studied and little is known about these viruses.


The family has one genus, Plasmavirus, which has one recognized member. There are five tentative members of Plasmavirus.


The genome is condensed, nonsegmented and consists of a single molecule of circular, supercoiled double-stranded DNA, 12 kilobase pairs in length. The genome has a rather high G-C content of ~32%.[1] It encodes at least 15 proteins, of which at least four are structural proteins embedded in the membrane.


A productive infectious cycle begins before a lysogenic cycle establishes the virus in the infected bacteria. After initial infection of the viral genome the virus may become latent within the host. Lysogeny involves integration into the host chromosome.


  1. ^ Büchen-Osmond, C. (Ed) (2003). 00.053. Plasmaviridae. In: ICTVdB—The Universal Virus Database, version 3. Büchen-Osmond, C. (Ed), ICTVdB Management, The Earth Institute and Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA.

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