Bullavirinae is a subfamily of viruses in the family Microviridae. Enterobacteria serve as natural hosts. There are 14 species in this subfamily, organized into three genera.[1]
| Bullavirinae | |
|---|---|
Virus classification 
| |
| (unranked): | Virus |
| Realm: | Monodnaviria |
| Kingdom: | Sangervirae |
| Phylum: | Phixviricota |
| Class: | Malgrandaviricetes |
| Order: | Petitvirales |
| Family: | Microviridae |
| Subfamily: | Bullavirinae |
| Genera | |
The following genera and species are recognized:[1]
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.[2]
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.[citation needed]
Enterobacteria serve as the natural host. Transmission routes are passive diffusion.[2]