Source:http://linkedlifedata.com/resource/umls/id/C0042761
MSH: A group of pathogens comprising the smallest known agents of infectious disease. They are unencapsulated and are capable of replicating autonomously in susceptible cells. Positively identified viroids composed of single-stranded RNA have been isolated from higher plants, but the existence of DNA viroids pathogenic to animals is suspected.,NCI: A plant virus with a genome of circular single-stranded RNA without a protein coat.