spiromicrovirus spiromicrovirus spiromicrovirus is a genus of viruses, in the family microviridae, in the subfamily gokushovirinae. spiroplasma bacteria serve as natural hosts. there is only one species in this genus: spiroplasma virus spv4. spiromicrovirus virus classification (unranked): virus realm: monodnaviria kingdom: sangervirae phylum: phixviricota class: malgrandaviricetes order: petitvirales family: microviridae subfamily: gokushovirinae genus: spiromicrovirus structure viruses in spiromicrovirus 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. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation spiromicrovirusicosahedralt=1non-envelopedcircularmonopartite 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. spiroplasma bacteria serve as the natural host. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission spiromicrovirusbacteria: spiroplasmanonepilus adsorptionlysiscytoplasmcytoplasmpilus