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.

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Overview

Feature Articles

Latest Virus News and Research

Penn researchers develop optimized framework for COVID-19 vaccination distribution

Penn researchers develop optimized framework for COVID-19 vaccination distribution

New technique identifies SARS-CoV-2 in blood and other fluids with high sensitivity

New technique identifies SARS-CoV-2 in blood and other fluids with high sensitivity

U.S. mosquito species show minimal risk of spreading Oropouche virus, study finds

U.S. mosquito species show minimal risk of spreading Oropouche virus, study finds

APOBEC proteins linked to DNA repeat expansion in Huntington's disease

APOBEC proteins linked to DNA repeat expansion in Huntington's disease

Social interventions could lead to major drop in national HIV incidence

Social interventions could lead to major drop in national HIV incidence

Innovative research links biometric data to mood prediction in shift workers

Innovative research links biometric data to mood prediction in shift workers

Study sheds light on the dynamics of non-persistent HPV infections

Study sheds light on the dynamics of non-persistent HPV infections

Tanzania's announces Marburg virus outbreak with single case in Kagera

Tanzania's announces Marburg virus outbreak with single case in Kagera

New EU project aims to advance pandemic preparedness

New EU project aims to advance pandemic preparedness

Rising Toscana virus infections in Italy highlight climate-driven health risks

Rising Toscana virus infections in Italy highlight climate-driven health risks

Breakthrough study maps critical structure of Nipah virus polymerase

Breakthrough study maps critical structure of Nipah virus polymerase

Study uncovers key role of NSP4 in rotavirus disease severity

Study uncovers key role of NSP4 in rotavirus disease severity

New discovery in HIV vaccine response reveals surprising antibody behavior

New discovery in HIV vaccine response reveals surprising antibody behavior

Researchers investigate myocarditis in preschoolers caused by parvovirus B19 outbreak

Researchers investigate myocarditis in preschoolers caused by parvovirus B19 outbreak

Brain neurons that respond to sugar and fat offer new insights into obesity control

Brain neurons that respond to sugar and fat offer new insights into obesity control

Tofacitinib reduces SARS-CoV-2 infection risk in patients with PTPN2 deficiency

Tofacitinib reduces SARS-CoV-2 infection risk in patients with PTPN2 deficiency

NIMH awards $1.5 million grant for long COVID neurological research

NIMH awards $1.5 million grant for long COVID neurological research

Broadband access associated with fewer COVID-19 cases and deaths

Broadband access associated with fewer COVID-19 cases and deaths

Alcohol consumption increases risks of cirrhosis and HCC in patients with HBV infection

Alcohol consumption increases risks of cirrhosis and HCC in patients with HBV infection

Scientists discover how viral infection triggers autoimmune disease

Scientists discover how viral infection triggers autoimmune disease

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