Virus
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- a self-replicating program that spreads by inserting copies of itself into other executable code or documents. A program into which a virus has inserted itself is said to be infected, and the infected file (or executable code that is not part of a file) is a host. Viruses are a kind of malware (malicious software). Viruses can be intentionally destructive, for example by destroying data, but many viruses are merely annoying. Some viruses have a delayed payload, sometimes referred to a bomb. The primary dow
AmDoc - Cite This Source - This Definition - Alphanumeric, EOF (End of File), Page File/Paging File, Reverse Engineering, Swap File
- Viruses are smaller than a single cell or bacteria and cannot reproduce outside a living organism.
ATSDR: Agency for Toxic Substances & Disease Registry - Cite This Source - This Definition - (VY-rus) In medicine, a very simple microorganism that infects cells and may cause disease. Because viruses can multiply only inside infected cells, they are not considered to be alive.
National Cancer Institute - Cite This Source - This Definition - hepatitis, hepatitis A virus, hepatitis C virus, hepatitis D virus, hepatitis delta virus, hepatitis E virus, hepatitis G virus, paralysis
- An infectious particle composed of a protein capsule and a nucleic acid core, which is dependent on a host organism for replication. A double-stranded DNA copy of an RNA virus genome that is integrated into the host chromosome during lysogenic infection. (See Coat protein, DNA, Genome, Host, Nucleic acid, RNA, Tumor virus.)
Susan Allender-Hagedorn and Charles Hagedorn - Cite This Source - This Definition - An infectious particle composed of a protein capsule and a nucleic acid core (DNA or RNA ), which is dependent on a host organism for replication.
UN Food and Agriculture Organization - Cite This Source - This Definition - A noncellular biological entity that can reproduce only within a host cell. Viruses consist of nucleic acid covered by protein; some animal viruses also are surrounded by a membrane. Inside the infected cell, the virus uses the synthetic capability of the host to produce progeny viruses.
USDA CSREES - Cite This Source - This Definition - glycosylation, labelling, nucleoprotein, Proteinaceous infectious particle (prion)
- A noncellular biological entity that can reproduce only within a host cell. Viruses consist of nucleic acid covered by protein; some animal viruses are also surrounded by membrane. Inside the infected cell, the virus uses the synthetic capability of the host to produce progeny virus. See also: cloning vector
Human Genome Project - Cite This Source - This Definition - bacterial artificial chromosome (BAC), bacteriophage, cloning vector, cosmid, gene transfer, P1-derived artificial chromosome (PAC), phage, plasmid, Retroviral infection, Transfection, Vector, yeast artificial chromosome (YAC)
- A submicroscopic pathogen composed essentially of a core of DNA or RNA enclosed by a protein coat, able to replicate only within a living cell.
The President's Council on Bioethics - Cite This Source - This Definition - Chromosomes, cytoplasm, DNA, DNA methylation, Enucleated, mitochondrial DNA, Nucleus, retinoic acid, ribonucleic acid (RNA), telomerase
- A malicious computer program designed specifically to replicate itself and spread from computer to computer. A virus may damage hardware, software, or data. [Exchange 2007]
Microsoft - Cite This Source - This Definition - ethical wall, Virus Scanning API, VSAPI (Virus Scanning API)
- A self-replicating program that runs and spreads by modifying other programs or files
NIST - Cite This Source - This Definition - Boot Sector Virus, Computer Virus, File Infector Virus, Macro Virus, Malicious Code, Trojan Horse, Virus Hoax, Warez, Worm
- An unwanted program which places itself into other programs, which are shared among computer systems, and replicates itself. Note: A virus is usually manifested by a destructive or disruptive effect on the executable program that it affects. 2. Self-replicating, malicious program segment that attaches itself to an application program or other executable system component and leaves no obvious signs of its presence. [INFOSEC-99]
ATIS - Cite This Source - This Definition - anti-virus program, data authentication, vaccine program, virus signature