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'''Passenger virus''' is a term used in [[virology]] to describe a virus that is found in a host but does not cause any apparent disease. These viruses are often discovered during [[genomic sequencing]] studies when the DNA or RNA of a host organism is being studied for other purposes.

== Overview ==

The concept of a passenger virus is relatively new in the field of virology. It was first proposed in the early 2000s when researchers began to notice that many organisms, including humans, carry a large number of viruses that do not cause any apparent disease. These viruses are often referred to as the [[virome]], which is the collective term for all the viruses that inhabit a particular organism or ecosystem.

== Characteristics ==

Passenger viruses are characterized by their lack of pathogenicity. They are often found in healthy individuals and do not cause any apparent disease. However, they may become pathogenic under certain conditions, such as when the host's immune system is compromised.

Passenger viruses can be found in various parts of the body, including the [[gut]], [[skin]], and [[respiratory tract]]. They can also be found in various types of organisms, including humans, animals, and plants.

== Role in Health and Disease ==

The role of passenger viruses in health and disease is not fully understood. Some researchers believe that they may play a role in maintaining the health of the host by competing with pathogenic viruses for resources. Others believe that they may contribute to disease by altering the host's immune response or by interacting with other microbes in the [[microbiome]].

== Research ==

Research on passenger viruses is still in its early stages. However, several studies have suggested that they may play a role in various diseases, including [[cancer]], [[autoimmune diseases]], and [[neurological disorders]]. Further research is needed to fully understand the role of passenger viruses in health and disease.

== See Also ==

* [[Virology]]
* [[Virome]]
* [[Microbiome]]
* [[Pathogen]]

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Passenger virus - Revision history

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