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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
- Virus
- LinearCircularSegmented
A virus is a tiny infectious agent that reproduces inside the cells of living hosts. When infected, the host cell is forced to rapidly produce thousands of identical copies of the original virus. Unlike most living things, viruses do not have cells that divide; new viruses assemble in the infected host cell.
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What is a virus in biology?
Where did viruses come from?
Do viruses cause diseases?
What is an example of a viral disease?
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [1] Examples are the common cold, gastroenteritis and pneumonia.
TypeFamilyTransmissionDiseasesdroplet contact fecal-oral venereal ...gastroenteritis keratoconjunctivitis ...fecal-oral respiratory droplet contactHand, foot and mouth disease pleurodynia ...vertical transmission bodily fluidsinfectious mononucleosis Cytomegalic ...salivainfectious mononucleosis Burkitt's ...- Viral infection
Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal.
ICTV announced "severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)" as the name of the new virus on 11 February 2020. This name was chosen because the virus is genetically related to the coronavirus responsible for the SARS outbreak of 2003. While related, the two viruses are different.
- membrane proteins (M)
- spike glycoprotein (S)
COVID-19 pandemic. "The pandemic" redirects here. For other uses, see Pandemic (disambiguation) and List of epidemics and pandemics. Part of a series on the. COVID-19 pandemic. COVID-19 (disease) SARS-CoV-2 (virus) Cases. Deaths. Timeline. Locations. International response. Medical response. Variants. Economic impact and recession. Impacts.
History of virology. Electron micrograph of the rod-shaped particles of tobacco mosaic virus that are too small to be seen using a light microscope. The history of virology – the scientific study of viruses and the infections they cause – began in the closing years of the 19th century.
