How do we came to know about virus?
106552
Well, the first "computer virus" was released 20 years ago this month.  It was called "Pakestani Brain", and was only spread by floppy disks.  That did not stop it from spreading around the world.\n\nDavid Gerrold is often aknowledged as creating the term "Computer Virus".  In 1972 he wrote a book called "When H.A.R.L.I.E. Was One".  In it, he talked about a series of "computer virus" which spread by themselves.  And remember, this was over a decade before they would exist for real.
675394
virus is an unwanted harmful program.many programs are useful (eg Internet Explorer,WinZip,Winamp) but some are made do harm.to protect us Antiviruses,Firewalls and other softwares/hardwares are used .
652172
The answers to these questions would be specific to whatever virus you are interested in looking at. Some viruses can be cultured, some cannot. Immunofluorescence requires that you have an antibody that is specific for the virus you are trying to detect
1058516
Let's explain this in human terms- \n\nA virus to a computer is like a viral infection to a human.  It is like the air bound bacteria that travels through the air that cause us to get ill if contacted- such like a common cold.  Unlike us, a computer doesn't have a natural immune system to protect it from bad elements, and that why an Up-To -Date Anti-Virus Program with  auto-updating virus definitions is very essential.  Computer viruses and all other pest and scary crawlers are all over the virtual web.  \nA computer can easily catches a virus by us clicking on a link, more opening a document that already has a virus in it, etc....  Consequently, the level of damages a virus can do to a PC depends on its incubation period(how long b4 noticed) and its characteristics(the purpose in nature. ex- keylogger, hacker, etc...).  A general virus symtoms are 1.  Your PC runs extremely slow all of a sudden. 2. changes in display resolutions.  3. frozen. and 4. "if it sneezed."  HA!  HA!\nI have a theory that computer viruses is evolving although there hasn't been proofed facts about computer virus mutations.  By observing the similarities of different viruses' habitats and the linkages btw their family trees(1), I came with the theory that many new viruses are actually evolved from the previous ones within that family.  Relevantly, other more serious bugs like worms, swans, and etc are actually albinos mutated from the many virus families; which is one of the reasons why these are harder to get rid.
693283
I don't know off the top of my head, but try looking here. It has loads of good and useful virology info.\nhttp://www-micro.msb.le.ac.uk/
126567
In computer security technology, a virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents. A computer virus behaves in a way similar to a biological virus, which spreads by inserting itself into living cells. Extending the analogy, the insertion of a virus into the program is termed as an infection, and the infected file (or executable code that is not part of a file) is called a host. \n\nIn the context of computer software, a Trojan horse is a malicious program that is disguised as legitimate software. The term is derived from the classical myth of the Trojan horse. In the siege of Troy, the Greeks left a large wooden horse outside the city. The Trojans were convinced that it was a gift, and moved the horse to a place within the city walls. It turned out that the horse was hollow, containing Greek soldiers who opened the city gates of Troy at night, making it possible for the Greek army to pillage the city. Trojan horse programs work in a similar way: they may look useful or interesting (or at the very least harmless) to an unsuspecting user, but are actually harmful when executed.\n\nA computer worm is a self-replicating computer program, similar to a computer virus. A virus attaches itself to, and becomes part of, another executable program; however, a worm is self-contained and does not need to be part of another program to propagate itself. \n\nhttp://en.wikipedia.org/wiki/Computer_virus
502605
Viruses can't replicate on their own so you have to do it in a cell culture.  Look up "cell culture" and you will find lots of information as this has been done for quite a few years now.
11426
You can find all the info here:\nhttp://www.cbwinfo.com/Biological/Pathogens/OMSKV.html
239438
Depends on the virus.  Without that info I cannot answer your question.\n\nFirst get a virus scanner to identify the virus if you have one and then we can go form there.\n\nNote to Zodiac.  What youa re saying is incorrect.  Most viruses cannot just be removed by anti virus software.  A lot of them for instance will need you to go into safe mode.  Others need to be removed manually or with special tools which are often free.  \n\nThe virus software will be good as it will identify the virus and then we can tell him what he needs to do to remove it.
385229
You can find some excellent information and pictures at:\nhttp://www.virology.net/Big_Virology/BVDNAmyo.html\n\nor if you are looking for higher level information you can find a good paper at http://www.pubmedcentral.gov/articlerender.fcgi?tool=pubmed&pubmedid=12626685\n\nwww.pubmed.com is a great source for any scholastic/scientific information.  You can read all of the latest research that has been published in peer reviewed journals there.  Its worth the time to learn how to use it.
57521
Viruses are the programs that run unwantedly on the background with harmful effects. The Virus may delete your files, or fill all your Hard Disk without leaving any space or shut down your PC unwantedly, or send unwanted mails without your knowledge or something else. The virus programmers will be taking advatage of the weaknesses of the OS.\nMostly the computers will be infected by the viruses from Internet or Floppy/CD.\nNever Connect to the internet without a good Antivirus installed.
494683
Usually virus's are programs to attack different fields of the computer.  If it is a trojan horse then it will be sleeping on your computer waiting for you to hit the Requirement(could be a folder, or type a leter of number, etc.) that was set to release the virus into your computer to do the damage.
753317
Bored at work:\n\nYou could look for reverse transcriptase activity in infected cells.  This is a sure sign of RNA being turned into DNA.\n\nYou could purify virus from the aftermath of infected cells.  Then set up experiments to determine the nature of what you've isolated and what its properties are.
403247
Essentially the first question is right, but human viruses are very clever in that several coat layers are used. for example HPV, HSV (herpes).  Viruses are just proteins and DNA, nothing more.  They don't contain organelles, they don't reproduce independantly, they don't fulfill many life functions.
22422
Different virus programs detect different viruses.  The people who write virus definitions (the clues that your program uses to look for viruses) can only create definitions for viruses they know about.  It's entirely possible that the different companies know about different viruses.  Therefore, why not use all of them?
195591
They're different types of viruses.  \n\nViruses are a large family of infectious agents.  They all look different, and they do different things to your body.  Rabies, the flu and herpes are also viruses - and each one makes you sick in it's own unique way.\n\nMaybe it's easier to think of it like this; in this world, there are sharks, flounders and clown fish.  They're all from the same family (fish) - but they are all look and behave differently from one another aren't they?  Same thing goes for viruses, bacteria & almost every other thing on the planet!  Things simply evolve in special ways to serve a purpose.
1125776
How could we know that?