What are the families of RNA viruses?

Genomes of positive-strand RNA viruses fold into complex structures. These RNA structural elements have key roles in genome replication, transcription, and translation. Families include: Picornaviridae, Flaviviridae, Togaviridae, Hepeviridae, Coronaviridae, Arteriviridae, Toroviridae, among many others.

How many families of RNA viruses are there?

Currently, there are 5 orders and 47 families of RNA viruses recognized. There are also many unassigned species and genera. Related to but distinct from the RNA viruses are the viroids and the RNA satellite viruses.

Are all RNA viruses retroviruses?

All retroviruses are protein-enveloped, positive-stranded RNA viruses that encode a unique enzyme, RT, capable of catalyzing the flow of genetic information from RNA to DNA, counter to that of most biologic systems.

Which viruses are RNA viruses?

1.1. RNA Viruses. Human diseases causing RNA viruses include Orthomyxoviruses, Hepatitis C Virus (HCV), Ebola disease, SARS, influenza, polio measles and retrovirus including adult Human T-cell lymphotropic virus type 1 (HTLV-1) and human immunodeficiency virus (HIV).

What is the family RNA?

Introduction. Members of the virus family Narnaviridae are the simplest of known RNA viruses, consisting of a single molecule of positive-sense RNA that may be as small as 2.3 kb and encoding only an RNA-dependent RNA polymerase (RdRp) to direct their own replication.

Is polio an RNA virus?

Poliovirus, the prototypical picornavirus and causative agent of poliomyelitis, is a nonenveloped virus with a single-stranded RNA genome of positive polarity. The virion consists of an icosahedral protein shell, composed of four capsid proteins (VP1, VP2, VP3, and VP4), which encapsidates the RNA genome (1).

What are the virus families?

DNA viruses

Is measles a DNA or RNA virus?

The measles virus is a single-stranded RNA virus of the genus Morbillivirus and the family Paramyxoviridae. The virus is related to several viruses that infect animals, including the Canine Distemper Virus.