A<unk>  is a virus belonging to the family Picornaviridae.<unk> es are non-enveloped, positive-stranded RNA viruses with an icosahedral capsid. The genome RNA is unusual because it has a protein on the 5' end that is used as a primer for transcription by RNA polymerase. The name is derived from pico meaning small, and RNA referring to the ribonucleic acid genome, so<unk> " literally means small RNA virus.<unk> es are separated into nine distinct genera and include many important pathogens of humans and animals. The diseases they cause are varied, ranging from acute "common-cold"-like illnesses, to chronic infections in livestock. Two main categories are enteroviruses and  rhinoviruses.
Picornavirus
Arenavirus
Endornavirus
Marnavirus
Hantavirus
Arbovirus
Coronavirus
Ophiovirus