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The genus includes viruses similar to the Cucumber mosaic virus, a very common plant virus with many hosts. The viruses cause mosaic symptoms and are transmitted by aphids or through sap.
They have small isometric particles (29 nm) with a tripartite, single stranded RNA plus sense genome (RNA1 with 3300-3400 nt, RNA2 with ~3000 nt, RNA3 with 2100-2200 nt). The ssRNA is translated into double stranded RNA.
Currently, the following species have been entered into the system: