Virion Properties
Morphology
Virions consist of a capsid. Virus capsid is not enveloped. Capsid/nucleocapsid is elongated with helical symmetry. The capsid is filamentous and very flexuous and curved with a length of (150-)1500-2200 nm and a width of 12 nm. Axial canal is distinct, or indistinct. Basic helix is obvious, or obscure. Pitch of helix is 3-3.528-3.7 nm.
Electron microscopic preparation and references: Virus preparation contains few virions, or many virions.