avastrovirus avastrovirus avastrovirus is a genus of viruses, in the family astroviridae. birds serve as natural hosts. there are three species in this genus. diseases associated with this genus include: gastroenteritis, liver or kidney damages. avastrovirus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: stelpaviricetes order: stellavirales family: astroviridae genus: avastrovirus taxonomy the genus contains the following species: avastrovirus 1 avastrovirus 2 avastrovirus 3 structure viruses in avastrovirus are non-enveloped, with icosahedral and spherical geometries, and t=3 symmetry. the diameter is around 35 nm. genomes are linear and non-segmented, around 6.8-7kb in length. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation avastrovirusicosahedralt=3non-envelopedlinearmonopartite life cycle viral replication is cytoplasmic. entry into the host cell is achieved by attachment to host receptors, which mediates endocytosis. replication follows the positive stranded rna virus replication model. positive stranded rna virus transcription, using an unknown model of subgenomic rna transcription is the method of transcription. translation takes place by -1 ribosomal frameshifting. birds serve as the natural host. transmission routes are fecal-oral. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission avastrovirusbirdsenterocytescell receptor endocytosisbuddingcytoplasmcytoplasmoral-fecal