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(Tıp) virus

{n} foul matter from ulcers, poison

A program that is very damaging to your computer should it infect your system Running an antivirus program such as Inoculate, is very beneficial in stopping the threat of computer meltdown You can read more about it here on our Trojans, Viruses and Worms reference page

Small program that attaches itself to a legitimate program When the legitimate program runs, the virus copies itself onto other legitimate programs in a form of reproduction

-A malicious program that replicates itself and may cause damage to a computer system by attacking or attaching itself to boot information, another program or a document that uses macros

A virus is software used to infect a computer Virus code is usually buried within the code of another program Once the program is executed the virus is activated and attaches copies of itself to other programs in the system Infected programs copy the virus to other programs The effects of a virus can range from harmless messages that appear on screen to destruction of data, either right away or on a set date File attachments in e-mail messages are a common source of virus One rule of thumb is to NEVER double click (execute) an attachment to a e-mail unless you are sure who it is from and that it is safe to do so

The special contagion, inappreciable to the senses and acting in exceedingly minute quantities, by which a disease is introduced into the organism and maintained there

A virus is a kind of germ that can cause disease. There are many different strains of flu virus

A program that can "infect" other programs by modifying them to include a, possibly evolved, copy of itself

Fig

A small, self-replicating, malicious program that attaches itself to an executable file or vulnerable application and delivers a payload that ranges from annoying to extremely destructive A file virus executes when an infected file is accessed A macro virus infects the executable code embedded in Microsoft® Office® programs that allows users to generate macros

A piece of programming code inserted into other programming to cause some unexpected and usually undesirable event, such as lost or damaged files Viruses can be transmitted by downloading programming from other sites or be present on a diskette The source of the file you're downloading or of a diskette you've received is often unaware of the virus The virus lies dormant until circumstances cause its code to be executed by the computer

a piece of programming code usually disguised as something else that causes some unexpected and, for the victim, usually undesirable event and which is often designed so that it is automatically spread to other computer users Viruses can be transmitted by sending them as attachments to an e-mail note, by downloading infected programming from other sites, or be present on a diskette or CD The best protection against a virus is to know the origin of each program or file you load into your computer or open from your e-mail program

A computer virus

A self-replicating program that is hidden in another piece of computer code, such as an email

A program designed to replicate itself and spread to other computers Some viruses additionally are designed to damage data or halt operations on a system Viruses can spread through diskettes, CD-ROMs, email attachments, and the Internet (See the Quick Tip on viruses at http: //xbase ucdavis edu/itx/article cfm?art=307 )

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 Return to Top

applied to organic poisons

A submicroscopic infectious organism, now understood to be a non-cellular structure consisting of a core of DNA or RNA surrounded by a protein coat that requires a living cell to replicate - often causes disease in the host organism

In computer technology, a virus is a program that introduces itself into a system, altering or destroying the information stored in the system. Microscopic, simple infectious agent that can multiply only in living cells of animals, plants, or bacteria. Viruses are much smaller than bacteria and consist of a single-or double-stranded nucleic acid (DNA or RNA) surrounded by a protein shell called a capsid; some viruses also have an outer envelope composed of lipids and proteins. They vary in shape. The two main classes are RNA viruses (see retrovirus) and DNA viruses. Outside of a living cell, a virus is an inactive particle, but within an appropriate host cell it becomes active, capable of taking over the cell's metabolic machinery for the production of new virus particles (virions). Some animal viruses produce latent infections, in which the virus persists in a quiet state, becoming periodically active in acute episodes, as in the case of the herpes simplex virus. An animal can respond to a viral infection in various ways, including fever, secretion of interferon, and attack by the immune system. Many human diseases, including influenza, the common cold, and AIDS, as well as many economically important plant and animal diseases, are caused by viruses. Successful vaccines have been developed to combat such viral diseases as measles, mumps, poliomyelitis, smallpox, and rubella. Drug therapy is generally not useful in controlling established viral infections, since drugs that inhibit viral development also inhibit the functions of the host cell. See also adenovirus; arbovirus; bacteriophage; picornavirus; plant virus; poxvirus. human immunodeficiency virus computer virus Epstein Barr virus plant virus polyoma virus West Nile virus

A computer virus is a little program, created by mean human beings, the purpose of which is to replicate and attach itself to your computer files and folders, and (usually) cause some kind of damage to your computer Computer viruses can be really mean Read protecting your computer from virus to learn more

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