Question: What forms the genetic material of some viruses?
About the article "RNA", section "Double-stranded RNA".

Candidate passages:
Double-stranded RNA (dsRNA) is RNA with two complementary strands, similar to the DNA found in all cells.
dsRNA forms the genetic material of some viruses (double-stranded RNA viruses).
Double-stranded RNA such as viral RNA or siRNA can trigger RNA interference in eukaryotes, as well as interferon response in vertebrates.
A virus is a small infectious agent that replicates only inside the living cells of other organisms.
Viruses can infect all types of life forms, from animals and plants to bacteria and archaea.
Since Dmitri Ivanovsky's 1892 article describing a non-bacterial pathogen infecting tobacco plants, and the discovery of the tobacco mosaic virus by Martinus Beijerinck in 1898, about 5,000 viruses have been described in detail, although there are millions of different types.
Viruses are found in almost every ecosystem on Earth and are the most abundant type of biological entity.
The study of viruses is known as virology, a sub-speciality of microbiology.
Virus particles (known as virions) consist of two or three parts: i) the genetic material made from either DNA or RNA, long molecules that carry genetic information; ii) a protein coat that protects these genes; and in some cases iii) an envelope of lipids that surrounds the protein coat when they are outside a cell.
The shapes of viruses range from simple helical and icosahedral forms to more complex structures.
The average virus is about one one-hundredth the size of the average bacterium.
Most viruses are too small to be seen directly with an optical microscope.
The origins of viruses in the evolutionary history of life are unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria.
In evolution, viruses are an important means of horizontal gene transfer, which increases genetic diversity.
Viruses are considered by some to be a life form, because they carry genetic material, reproduce, and evolve through natural selection.
However they lack key characteristics (such as cell structure) that are generally considered necessary to count as life.
Because they possess some but not all such qualities, viruses have been described as "organisms at the edge of life".
Viruses spread in many ways; viruses in plants are often transmitted from plant to plant by insects that feed on plant sap, such as aphids; viruses in animals can be carried by blood-sucking insects.
These disease-bearing organisms are known as vectors.
Influenza viruses are spread by coughing and sneezing.
Norovirus and rotavirus, common causes of viral gastroenteritis, are transmitted by the faecal–oral route and are passed from person to person by contact, entering the body in food or water.
HIV is one of several viruses transmitted through sexual contact and by exposure to infected blood.
The range of host cells that a virus can infect is called its "host range".
This can be narrow or, as when a virus is capable of infecting many species, broad.
Viral infections in animals provoke an immune response that usually eliminates the infecting virus.
Immune responses can also be produced by vaccines, which confer an artificially acquired immunity to the specific viral infection.
However, some viruses including those that cause AIDS and viral hepatitis evade these immune responses and result in chronic infections.
Antibiotics have no effect on viruses, but several antiviral drugs have been developed. 
The human virome is a part of our bodies and will not always cause harm.
Many latent and asymptomatic viruses are present in the human body all the time.
Viruses infect all life forms; therefore the bacterial, plant, and animal cells and material in our gut also carry viruses.
Through one's immune system, the body has the ability to protect itself from other viruses that may cause disease.
When viruses cause harm by infecting the cells in the body, a symptomatic disease may develop.
Contrary to common belief, harmful viruses may be in the minority compared to benign viruses in the human body.
It is much harder to identify viruses than it is to identify bacteria, therefore our understanding of benign viruses in the human body is very rudimentary.
The health effects of viruses on an individual are dependent on the individual's immune function and cell surface proteins, which are determined by genetics and vary with genetic polymorphisms across the population and over time in relation to age and other factor determining immune status. 
This complex method of transcription is generally restricted to viruses, especially those of the single-stranded, positive-sense RNA or Class IV viruses using the Baltimore Classification System.
Its use is primarily used for compacting more genetic information into a shorter amount of genetic material. 
All viruses bind to their hosts and introduce their genetic material into the host cell as part of their replication cycle.
This genetic material contains basic 'instructions' of how to produce more copies of these viruses, hacking the body's normal production machinery to serve the needs of the virus.
The host cell will carry out these instructions and produce additional copies of the virus, leading to more and more cells becoming infected.
Some types of viruses insert their genome into the host's cytoplasm, but do not actually enter the cell.
Others penetrate the cell membrane disguised as protein molecules and enter the cell.
There are two main types of virus infection: lytic and lysogenic.
Shortly after inserting its DNA, viruses of the lytic cycle quickly produce more viruses, burst from the cell and infect more cells.
Lysogenic viruses integrate their DNA into the DNA of the host cell and may live in the body for many years before responding to a trigger.
The virus reproduces as the cell does and does not inflict bodily harm until it is triggered.
The trigger releases the DNA from that of the host and employs it to create new viruses.