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ICTV Virus Taxonomy Profile: Alphaflexiviridae

, Anna Maria Vaira, Wulf Menzel, , Sergey K. Zavriev, John Hammond, Ki Hyun Ryu, ICTV Report Consortium
Published: 1 July 2020

Abstract: The family Alphaflexiviridae includes viruses with flexuous filamentous virions that are 470–800 nm in length and 12–13 nm in diameter. Alphaflexiviruses have a single-stranded, positive-sense RNA genome of 5.5–9 kb. They infect plants and plant-infecting fungi. They share a distinct lineage of alphavirus-like replication proteins that is unusual in lacking any recognized protease domain. With a single exception, cell-to-cell and long-distance movement is facilitated by triple gene block proteins in plant-infecting genera. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the family Alphaflexiviridae, which is available at
Keywords: Alphaflexiviridae / ICTV / taxonomy

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