https://www.britannica.com/science/virus
virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria.The name is from a Latin word meaning "slimy liquid" or "poison.". The earliest indications of the biological nature of viruses came from studies in 1892 by the Russian scientist Dmitry I. Ivanovsky and in 1898 by the Dutch scientist Martinus W. Beijerinck.

https://www.mdpi.com/journal/viruses
Viruses is a peer-reviewed, open access journal of virology, published monthly online by MDPI.The American Society for Virology (ASV), Spanish Society for Virology (SEV), Canadian Society for Virology (CSV), Italian Society for Virology (SIV-ISV), Australasian Virology Society (AVS) and others are affiliated with Viruses and their members receive a discount on the article processing charges.

https://www.khanacademy.org/science/biology/biology-of-viruses/virus-biology/a/intro-to-viruses
A virus is a tiny, infectious particle that can reproduce only by infecting a host cell. Viruses "commandeer" the host cell and use its resources to make more viruses, basically reprogramming it to become a virus factory. Because they can't reproduce by themselves (without a host), viruses are not considered living.Nor do viruses have cells: they're very small, much smaller than the cells of

https://en.wikipedia.org/wiki/Virus
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity. Since Dmitri Ivanovsky's 1892 article describing a non-bacterial pathogen

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Concepts_in_Biology_(OpenStax)/17%3A_The_Immune_System_and_Disease/17.01%3A_Viruses
Viruses replicate, but to do so, they are entirely dependent on their host cells. They do not metabolize or grow, but are assembled in their mature form. Figure 17.1.1 17.1. 1: (a) The tobacco mosaic virus, seen by transmission electron microscopy, was the first virus to be discovered.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7123905/
Viruses are infectious units with diameters of about 16 nm (circoviruses) to over 300 nm (poxviruses; Table 2.1 ). Their small size makes them ultrafilterable, i.e. they are not retained by bacteria-proof filters. Viruses have evolved over longtime period, and have adapted to specific organisms or their cells. The infectious virus particles, or

https://biologydictionary.net/virus/
Virus Definition. A virus is a chain of nucleic acids (DNA or RNA) which lives in a host cell, uses parts of the cellular machinery to reproduce, and releases the replicated nucleic acid chains to infect more cells. A virus is often housed in a protein coat or protein envelope, a protective covering which allows the virus to survive between hosts.. Virus Structure

https://www.nationalgeographic.org/encyclopedia/viruses/
Viruses are tiny infectious agents that rely on living cells to multiply. They may use an animal, plant, or bacteria host to survive and reproduce. As such, there is some debate as to whether or not viruses should be considered living organisms. A virus that is outside of a host cell is known as a virion.. Not only are viruses microscopic, they are smaller than many other microbes, such as

https://www.nature.com/scitable/definition/virus-308/
virus. A virus is an infectious agent that can only replicate within a host organism. Viruses can infect a variety of living organisms, including bacteria, plants, and animals. Viruses are so

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7122971/
Viruses bind to receptor sites on the cells of specific tissue. It is the presence of these receptor sites that make an animal or cell susceptible to the virus. The virus contains unique proteins, occasionally as surface projectiles that interact specifically with the receptors. Thus some viruses, such as hepatitis virus, attack the liver and

https://www.khanacademy.org/science/biology/biology-of-viruses
Evolution of viruses. (Opens a modal) The biology of Zika virus. (Opens a modal) Biology is brought to you with support from the Amgen Foundation. Biology is brought to you with support from the. This unit is part of the Biology library. Browse videos, articles, and exercises by topic.

https://www.livescience.com/53272-what-is-a-virus.html
Viruses are microscopic infectious agents that contain genetic material, either DNA or RNA, and must invade a host in order to multiply. Predominantly, viruses are known for causing disease, as

https://my.clevelandclinic.org/health/body/24861-virus
Viruses are microscopic organisms that can infect hosts, like humans, plants or animals. They're a small piece of genetic information (DNA or RNA) inside of a protective shell (capsid). Some viruses also have an envelope. Viruses can't reproduce without a host. Some common diseases caused by viruses include the flu, the common cold and

https://www.medicalnewstoday.com/articles/158179
Viruses are microscopic particles that are present in animals, plants, and other living organisms. They can sometimes cause diseases, such as the flu and COVID-19. Viruses are biological entities

https://www.sciencealert.com/virus
By ScienceAlert Staff. (Roger Harris/Science Photo Library/Getty Images) A virus is genetic material contained within an organic particle that invades living cells and uses their host's metabolic processes to produce a new generation of viral particles. The way they do this varies. Some insert their genetic material into the host's DNA, where

https://www.nationalgeographic.com/science/article/viruses/
Inside their cellular hosts, viruses can create an enormous number of copies and spread the infection to other cells. For example, if you get the flu, your body will be riddled with some hundred

https://www.cdc.gov/nrevss/php/dashboard/index.html
In this surveillance system, participating U.S. laboratories voluntarily report weekly to CDC the total number of tests performed to detect these viruses and the total number of those tests that were positive. They also report the specimen type, location, and week of collection. NREVSS allows for timely analysis of data to monitor viral seasons

https://www.nature.com/npjviruses/
npj Viruses is an online Open Access journal publishing all aspects of virology, including viruses and their micro and macroenvironment as well as the most promising intervention strategies.

https://www.verywellhealth.com/viruses-7106426
They can cause disease. Some viruses cause sickness, like common colds, the flu, and food poisoning. Symptoms of a viral infection include fever, pain, nausea, diarrhea, cough, congestion, shortness of breath, rashes, warts, and many others. The best treatment for most everyday viruses is rest, hydration, and time.

https://www.thoughtco.com/viruses-373893
Viruses cause a number of diseases in the organisms they infect. Human infections and diseases caused by viruses include Ebola fever, chicken pox, measles, influenza, HIV/AIDS, and herpes. Vaccines have been effective at preventing some types of viral infections, such as small pox, in humans. They work by helping the body to build an immune

https://byjus.com/biology/virus/
Viruses are an example of an organic nanoparticle in nanotechnology. They have been utilised as a model for arranging materials on the nanoscale due to their shape, size, and structures. One million viruses can be found in a spoonful of seawater, aquatic ecosystems' most abundant natural component. A virus can boost the number of

https://www.mdpi.com/journal/viruses/about
Viruses (ISSN 1999-4915) is an open access journal that provides an advanced forum for studies of viruses. It publishes reviews, regular research papers, communications, conference reports and short notes. Our aim is to publish papers that are of significant impact to the virology community. We encourage scientists to publish their experimental

https://medlineplus.gov/viralinfections.html
The symptoms can range from mild to very severe. Other times, your immune system may be able to fight it off and you may not have any symptoms. Each different virus usually only infects one type of cell in your body. For example, hepatitis viruses affect the cells in the liver. HIV infects a certain type of immune system cell.