the smallest organisms which cause diseases such as chicken pox, measles, rabies, flu, cold sores, and polio
Obligate intracellular “parasites"; Examples: HIV, herpes, rhinovirus, influenza [avian influenza H5N1], Norwalk (noroviruses), SARS (coronavirus), hepatitis (HAV, HBV, HCV) and bacteriophage
an intriguing possibility and one of great importance, since it is possible that a human cancer virus could be a member of an RNA virus group that normally causes non-oncogenic disease in man
Computer viruses are malicious programs that can cause damage to your computer and information on your computer. They can also slow down the Internet, and use your computer to spread themselves to your friends, family, coworkers, and the rest of the Internet.
nucleic acid-based infectious agents
The smallest life forms known, that are not cellular in nature. They live inside the cells of animals, plants and bacteria and often cause disease. They are made up of a chromosome surrounded by a protein shell.
small microscopic organisms that often cause disease.
Code written with the express intention of replicating itself. A virus attempts to spread from computer to computer by infecting another file, typically an executable program. Besides spreading, viruses can be used to do harm or for criminal activity.
any member of a unique class of infectious agents, which were originally distinguished by their smallness and their inability to replicate outside a living host cell e.g. IBR, BRSV, BVD, PI
microorganisms only able to multiply by infecting the cells of a host organism. Do not respond to antibiotics.
Viruses are very small. They invade the body cells and instruct the host cells to feed them and in turn they kill the cells. Diseases caused by viruses include the common cold, influenza, hepatitis A and B, HIV-1, herpes, measles, mumps, rabies, rubella and small pox.
extremely small and simple microbes. They are nothing more than a small segment of DNA surrounded by a protective shell. Viruses cannot reproduce on their own, they must take over the normal cell reproduction of another living host.
A virus is a piece of programming code usually disguised as something else that causes some unexpected and usually undesirable event. A virus is often designed so that it is automatically spread to other computer users. Viruses can be transmitted as attachments to an e-mail note, as downloads, or be present on a diskette or CD. The source of the e-mail note, downloaded file, or diskette you've received is often unaware of the virus. Some viruses wreak their effect as soon as their code is executed; other viruses lie dormant until circumstances cause their code to be executed by the computer. Some viruses are playful in intent and effect ("Happy Birthday, Ludwig!") and some can be quite harmful, erasing data or causing your hard disk to require reformatting.
Written by sad and lonelly individuales, these are small programs designed to reproduce themselves and cause undesirable actions. They insert themselves into other programs or onto disks and can destroy data or crash PC's. They can be picked up easily over the internet, which is why antivirus software is a essential purchase.
Programs that alter the way a computer works without the permission or knowledge of the user.
Submicroscopic disease-causing organisms that grow only inside living cells.
Malicious programmes, often spread by e-mail, that can damage the data on your computer or degrade its performance. MWEB scans all incoming e-mail for viruses to help keep you safe. However, it's a good idea to use your own anti-virus software as well to protect your machine from any viruses that you may get from elsewhere.
disease-causing agents, smaller than bacteria, that depend on other organisms for reproduction and growth.
Viruses are usually E-mailed to people to spread a cracking program
Viruses are organisms that use a host cell for reproduction, killing the host.
programs capable of replicating themselves with the intent to harm computer systems.
Small living particles that can infect cells and change how the cells function. Infection with a virus can cause a person to develop symptoms. The disease and symptoms that are caused depend on the type of virus and the type of cells that are infected.
programs that infect systems and cause damage. They are usually hidden within safe looking programs. Marco virus sequence of commands that, once loose within the system, can destroy it or shut it down.
Microscopic infectious agents, shaped like rods, spheres or filaments that can reproduce only within living host cells.
Living microscopic organisms that need living hosts to reproduce in. Their presence can cause infectious diseases which are sometimes mild, and sometimes severe.
Small programs that can cause a variety of problems ranging from minor annoyances to full-blown system crashes.
a minute particle that is capable of replication but only within living cells. They infect animals, plants and microorganisms.
Small destructive computer programs that screw up the computer's disk or memory, or cause other damage.
ultramicroscopic non-cellular organisms that replicate themselves inside the cells of living hosts Humans as organisms
Sub-microscopic organisms that cause infectious disease. In cancer therapy, some viruses may be made into vaccines that help the body build an immune response to and kill tumor cells.