|Genome: RNA Virus||Structure: Nonenveloped Virus, Icosahedral Virus|
- Picornaviruses are a family of structurally-related viruses which are characterized by possession of RNA genomes and their virion's extremely small physical size which gives them their namesake of Pico-RNA-Viruses. In general, Picornaviruses infect the GI system but can cause a wide variety of clinical consequences in other organs as well. This viral class is split into two basic genera, Enteroviruses and Rhinoviruses, with Enteroviruses tending to infect the lower GI tract and rhinoviruses tending to infect the extreme upper end of the GI tract (i.e. Nasopharynx).