Virus - Wikipedia
It can be a virus that is isolated from its natural reservoir or isolated as the result of spread to an animal or human host where the virus had not been identified before.

Virus | Definition, Structure, & Facts | Britannica
Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Viruses possess unique infective properties and thus often cause disease in host organisms. Learn about the history, types, and features of viruses.

VirusTotal - Home
VirusTotal Assistant Bot offers a platform for users to interact with VirusTotal's threat intelligence suite and explore artifact-related information effectively.

Viruses: Definition, Types, Characteristics & Facts
A virus is a small piece of genetic information in a “carrying case” — a protective coating called a capsid. Viruses aren’t made up of cells, so they don’t have all the equipment that cells do to make more copies of themselves.

What Is a Virus? Definition, Structure, and How Viruses Work
A virus is a microscopic infectious agent composed of genetic material—either DNA or RNA—enclosed within a protein coat known as a capsid. Some viruses also possess an outer lipid envelope derived from the host cell membrane.

Introduction to viruses - Wikipedia
When a virus infects a cell, the virus forces it to make thousands more viruses. It does this by making the cell copy the virus's DNA or RNA, making viral proteins, which all assemble to form new virus particles.

Virus - National Human Genome Research Institute
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 make copies of itself.

Virus - Simple English Wikipedia, the free encyclopedia
The genetic material within virus particles, and the method by which the material is replicated, varies considerably between different types of viruses. This false-coloured transmission electron micrograph depicts the ultrastructural details of an influenza virus particle, or “virion”.

What's Going Around Right Now? | 2026 Illness Tracker | Virus Watcher
Find out what illness is going around in your area right now. Real-time tracking of norovirus, flu, RSV, COVID, and stomach bugs by state. Updated daily.

What Is a Virus? - ScienceAlert
A virus is genetic material contained within an organic particle that invades living cells and uses their host's metabolic processes to produce a new generation of viral particles.