Fiersviridae

Fiersviridae is a family of positive-strand RNA viruses which infect prokaryotes. Bacteria, including enterobacteria, caulobacter, pseudomonas, and acinetobacter serve as natural hosts for these bacteriophages. They are small viruses with linear, positive-sense, single-stranded RNA genomes that encode four proteins. All phages of this family require bacterial pili to attach to and infect cells. The family has 185 genera. In 2020, the family was renamed from "Leviviridae" to its current name.
Structure.
Viruses in "Fiersviridae" are non-enveloped, with icosahedral and spherical geometries, and T=3 symmetry. Their virion diameter is around 26 nm. 
Genome.
Fiersviruses have a positive-sense, single-stranded RNA genome. It is linear and non-segmented and around 4kb in length. The genome encodes four proteins, which are the coat, replicase, maturation, and lysis protein.
Life cycle.
Entry into the host cell is achieved by adsorption into the host cell. Replication follows the positive-strand RNA virus replication model. Positive-strand RNA virus transcription is the method of transcription. Translation takes place by suppression of termination. The virus exits the host cell by bacteria lysis. Enterobacteria, caulobacter, pseudomonas, and acinetobacter serve as the natural host.
Taxonomy.
"Fiersviridae" contains 185 genera. Two notable genera are "Emesvirus", which contains bacteriophage MS2, and "Qubevirus", which contains bacteriophage Qbeta.