Virus

A virus is a microscopic infectious agent that can reproduce only inside a host cell. Viruses infect all types of organisms: from animals and plants, to bacteria and archaea. Since the initial discovery of tobacco mosaic virus by Martinus Beijerinck in 1898, more than 5,000 types of virus have been described in detail, although most types of virus remain undiscovered. Viruses are ubiquitous, as they are found in almost every ecosystem on Earth, and are the most abundant type of biological entity on the planet. The study of viruses is known as virology, and is a branch of microbiology.
What is a Virus?

A virus is a small infectious agent that can only replicate inside the cells of another organism. The word is from the Latin ''virus'' referring to poison and other noxious substances, first used in English in 1392. ''Virulent'', from Latin ''virulentus'' (poisonous), dates to 1400. A meaning of "agent that causes infectious disease" is first recorded in 1728, The term ''virion'' is also used to refer to a single infective viral particle. The plural is "viruses".

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Latest Virus News and Research

UD researchers gain new insights into hepatitis B virus' genetic blueprint

UD researchers gain new insights into hepatitis B virus' genetic blueprint

Study finds increase in support for telehealth and mobile health monitoring since COVID

Study finds increase in support for telehealth and mobile health monitoring since COVID

Radiation therapy delay for prostate cancer patients offers room for flexibility during the pandemic

Radiation therapy delay for prostate cancer patients offers room for flexibility during the pandemic

Research shows how a protein stops cells from attacking their own DNA

Research shows how a protein stops cells from attacking their own DNA

Vaping raises COVID-19 risk among teens and youth

Vaping raises COVID-19 risk among teens and youth

Natural controllers shed light on immunity mechanisms against hepatitis B

Natural controllers shed light on immunity mechanisms against hepatitis B

JAK inhibitors or type I interferon shown to reduce mortality in COVID-19

JAK inhibitors or type I interferon shown to reduce mortality in COVID-19

Study finds higher incidence of physical intimate partner violence during COVID-19

Study finds higher incidence of physical intimate partner violence during COVID-19

Membrane nanoparticles acts as a bait to trap SARS-CoV-2

Membrane nanoparticles acts as a bait to trap SARS-CoV-2

Researchers identify a protein that facilitates spread of SARS-CoV-2 virus through cells

Researchers identify a protein that facilitates spread of SARS-CoV-2 virus through cells

Synthetic nanobodies prevent SARS-CoV-2 infection

Synthetic nanobodies prevent SARS-CoV-2 infection

Lockdowns and business closures could fuel the rise of obesity, warn researchers

Lockdowns and business closures could fuel the rise of obesity, warn researchers

New research finds mHealth technologies as a viable option to monitor COVID-19 patients

New research finds mHealth technologies as a viable option to monitor COVID-19 patients

Study shows how viruses operate and evade the immune system

Study shows how viruses operate and evade the immune system

Study shows how picornaviruses infect the host cell

Study shows how picornaviruses infect the host cell

Contact tracers in Massachusetts might order milk or help with rent. Here’s why.

Contact tracers in Massachusetts might order milk or help with rent. Here’s why.

Compulsive spitting among tobacco users can increase COVID-19 transmission

Compulsive spitting among tobacco users can increase COVID-19 transmission

Turning anger into action: Minority students analyze COVID data on racial disparities

Turning anger into action: Minority students analyze COVID data on racial disparities

Dying young: The health care workers in their 20s killed by COVID-19

Dying young: The health care workers in their 20s killed by COVID-19

Promega introduces new serological antibody test for COVID-19

Promega introduces new serological antibody test for COVID-19