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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Overview

Feature Articles

Latest Virus News and Research

Better global health equality could prevent emergence of future SARS-CoV-2 variants of concern

Better global health equality could prevent emergence of future SARS-CoV-2 variants of concern

Study suggests vaccinated Omicron cases are unlikely to shed infectious virus 10 days after diagnosis or symptom onset

Study suggests vaccinated Omicron cases are unlikely to shed infectious virus 10 days after diagnosis or symptom onset

Dexamethasone shown to upregulate innate and adaptive immune responses in COVID-19 acute respiratory distress syndrome patients

Dexamethasone shown to upregulate innate and adaptive immune responses in COVID-19 acute respiratory distress syndrome patients

Study demonstrates that intra-host SARS-CoV-2 variants with reduced infectivity are developed during infection

Study demonstrates that intra-host SARS-CoV-2 variants with reduced infectivity are developed during infection

Study investigates whether immune responses to BNT162b2 vaccine differ in subjects with and without prior SARS-CoV-2 infection

Study investigates whether immune responses to BNT162b2 vaccine differ in subjects with and without prior SARS-CoV-2 infection

Study identifies cellular receptors for alphaviruses shared across mosquitoes, humans, and animals

Study identifies cellular receptors for alphaviruses shared across mosquitoes, humans, and animals

Pathogens turn off mitochondrial defense by hijacking a normal cellular response to stress

Pathogens turn off mitochondrial defense by hijacking a normal cellular response to stress

Study analyzes the impact of global trust in government due to the COVID-19 pandemic

Study analyzes the impact of global trust in government due to the COVID-19 pandemic

Mutations in SARS-CoV-2 Omicron variant promote cell binding

Mutations in SARS-CoV-2 Omicron variant promote cell binding

Monitoring rodents for SARS-CoV-2 and other coronaviruses, Hong Kong

Monitoring rodents for SARS-CoV-2 and other coronaviruses, Hong Kong

Topical antiseptic Acriflavine inhibits SARS-CoV-2 and other betacoronaviruses

Topical antiseptic Acriflavine inhibits SARS-CoV-2 and other betacoronaviruses

Genome editing in vascular endothelial cells made possible with a powerful new delivery system

Genome editing in vascular endothelial cells made possible with a powerful new delivery system

Cannabidiol may improve innate immune response against SARS-CoV-2

Cannabidiol may improve innate immune response against SARS-CoV-2

Rapid antigen test for SARS-CoV-2 proves to be highly accurate for pediatric populations

Rapid antigen test for SARS-CoV-2 proves to be highly accurate for pediatric populations

UK donates COVID-19 vaccines to Uganda to help tackle the pandemic

UK donates COVID-19 vaccines to Uganda to help tackle the pandemic

UV-C light prevents airborne transmission of SARS-CoV-2

UV-C light prevents airborne transmission of SARS-CoV-2

SARS-CoV-2 Omicron has similar infectious viral load to Delta

SARS-CoV-2 Omicron has similar infectious viral load to Delta

With no end in sight to pandemic life, parents find disruption is the new normal

With no end in sight to pandemic life, parents find disruption is the new normal

As omicron surges, effort to vaccinate young children stalls

As omicron surges, effort to vaccinate young children stalls

Exploring the relationship between stem cells and COVID-19

Exploring the relationship between stem cells and COVID-19