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Positive-strand RNA virus. Positive-strand RNA viruses (+ssRNA viruses) are a group of related viruses that have positive-sense, single-stranded genomes made of ribonucleic acid. The positive-sense genome can act as messenger RNA (mRNA) and can be directly translated into viral proteins by the host cell's ribosomes.
Animal RNA viruses are classified by the ICTV. There are three distinct groups of RNA viruses depending on their genome and mode of replication: Double-stranded RNA viruses (Group III) contain from one to a dozen different RNA molecules, each coding for one or more viral proteins. Positive-sense ssRNA viruses (Group IV) have their genome ...
During replication of the viral genome, RdRp synthesizes a positive-sense antigenome that it uses as a template to create genomic negative-sense RNA. Negative-strand RNA viruses also share a number of other characteristics: most contain a viral envelope that surrounds the capsid, which encases the viral genome, −ssRNA virus genomes are ...
The genome for Sepik virus is a non-segmented, single stranded, positive sense RNA molecule that is about 10.79 kilobases in length. [3]
Measles virus. The measles virus (MV), with scientific name Morbillivirus hominis, is a single-stranded, negative-sense, enveloped, non-segmented RNA virus of the genus Morbillivirus within the family Paramyxoviridae. It is the cause of measles. Humans are the natural hosts of the virus; no animal reservoirs are known to exist.
Negevirus is a taxon of non segmented, positive sense single stranded RNA viruses that have been isolated from mosquitoes and phlebotomine sand flies in Africa, the Americas, Asia and Europe. With the electron microscope the viruses appear to be spherical particles 45 to 55 nanometers in diameter.
Picornavirus. Picornaviruses are a group of related nonenveloped RNA viruses which infect vertebrates including fish, [2] mammals, and birds. They are viruses that represent a large family of small, positive-sense, single-stranded RNA viruses with a 30 nm icosahedral capsid.
They are positive-sense, single-stranded RNA which is not segmented. [2] Thirteen species are placed in this family, divided among eleven genera. [3] Diseases associated with this family include feline calicivirus (respiratory disease), rabbit hemorrhagic disease virus (often fatal hepatitis), and Norwalk group of viruses (gastroenteritis).