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- Viruses are tiny infectious agents that occupy a gray area between the living and nonliving realms. They cannot grow and reproduce on their own, making them parasites that require a host cell. Viruses can infect a large variety of living things, including bacteria, plants, and animals1. A virus is a microscopic, simple infectious agent that can multiply only in living cells of animals, plants, or bacteria. It consists of a single- or double-stranded nucleic acid (DNA or RNA) surrounded by a protein shell called a capsid; some viruses also have an outer envelope composed of lipids and proteins2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Viruses are tiny infectious agents that occupy a gray area between the living and nonliving realms. They cannot grow and reproduce on their own, making them parasites that require a host cell. Viruses can infect a large variety of living things, including bacteria, plants, and animals.scienceexchange.caltech.edu/topics/covid-19-coro…virus, Microscopic, simple infectious agent that can multiply only in living cells of animals, plants, or bacteria. Viruses are much smaller than bacteria and consist of a single- or double-stranded nucleic acid (DNA or RNA) surrounded by a protein shell called a capsid; some viruses also have an outer envelope composed of lipid s and proteins.www.britannica.com/summary/virus
Introduction to viruses - Wikipedia
Learn about the definition, structure, origin, spread, and effects of viruses, the tiny infectious agents that reproduce inside living hosts. Explore the history of virus discovery and the methods to study and treat viral infections.
Virus - Simple English Wikipedia, the free encyclopedia
Sep 18, 2004 · Learn about viruses, tiny parasites that can infect all living organisms and cause many diseases. Find out how viruses reproduce, their diversity, their structure, and their life cycle.
Viral disease - Wikipedia
29 rows · Learn about the characteristics, classification and examples of viral …
Virus | Definition, Structure, & Facts | Britannica
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Coronavirus - Wikipedia
The virus was then known as infectious bronchitis virus (IBV). Charles D. Hudson and Fred Robert Beaudette cultivated the virus for the first time in 1937. [ 18 ] The specimen came to be known as the Beaudette strain.
COVID-19 pandemic - Wikipedia
The virus was confirmed to have spread to Brazil on 25 February 2020, [377] when a man from São Paulo who had travelled to Italy tested positive for the virus. [378] The disease had spread to every federative unit of Brazil by 21 …
COVID-19 - Wikipedia
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2.The disease spread worldwide, resulting in the COVID-19 pandemic.. The symptoms of COVID‑19 can vary but often include fever, …
SARS-CoV-2 - Wikipedia
The virus is airborne and primarily spreads between people through close contact and via aerosols and respiratory droplets that are exhaled when talking, breathing, or otherwise exhaling, as well as those produced from coughs and …
Virus - National Human Genome Research Institute
2 days ago · A virus is an infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat. A virus cannot replicate alone; instead, it must infect cells and use components of the host cell to …
What is a Virus? - Caltech Science Exchange
Scientists have identified more than 200 virus species with the potential to infect humans. New viruses are discovered every year, some of which, like SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2), cause disease, while …
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