Taxonomy
The following genera and species are recognized: * Genus: '' Alphatrevirus''; species: ** '' Escherichia virus alpha3'' ** '' Escherichia virus ID21'' ** '' Escherichia virus ID32'' ** '' Escherichia virus ID62'' ** '' Escherichia virus NC28'' ** '' Escherichia virus NC29'' ** '' Escherichia virus NC35'' ** '' Escherichia virus phiK'' ** '' Escherichia virus St1'' ** '' Escherichia virus WA45'' * Genus: '' Gequatrovirus''; species: ** '' Escherichia virus G4'' ** '' Escherichia virus ID52 '' ** '' Escherichia virus Talmos'' * Genus: '' Sinsheimervirus''; species: ** '' Escherichia virus phiX174''Structure
Viruses in Bullavirinae are non-enveloped, with icosahedral and round geometries, and T=1 symmetry. The diameter is around 30 nm. Genomes are circular, around 6.1kb in length.Life cycle
Viral replication is cytoplasmic. Entry into the host cell is achieved by pilus-mediated adsorption into the host cell. Replication follows the ssDNA rolling circle model. DNA-templated transcription is the method of transcription. The virus exits the host cell by bacteria lysis. Enterobacteria serve as the natural host. Transmission routes are passive diffusion.References
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