Return to. This was the first clue to the nature of viruses, genetic entities that lie somewhere in the grey area between living and non-living states. Viruses depend on the host cells that they infect to reproduce. When found outside of host cells, viruses exist as a protein coat or capsid, sometimes enclosed within a membrane. www. ucmp. berkeley. edu/alllife/virus. html www. ucmp. berkeley. edu/alllife/virus. html. A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. The term "virus" is also commonly used, albeit erroneously, to refer to many different types of malware and adware programs. The original virus may modify the copies. en. wikipedia. org/wiki/Computer_virus en. wikipedia. org/wiki/Computer_virus. Influenza and Ebola are both viruses. Find out what a virus does to your body and how to decrease your chance of exposure. In this article, we will explore the world of viruses. We'll talk about what a virus is, what viruses look like, how they infect us and how we can reduce the risk of infection. www. howstuffworks. com/virus-human. htm www. howstuffworks. com/virus-human. htm. · Ireland On-Line · December 2 6:46 AM· Science Daily · December 2 7:20 AM · Channel 4 News · December 1 5:24 PM news. ask. com ·  . Probably there are no cells in nature that escape infection by one or more kinds of viruses. (Viruses that infect bacteria are called bacteriophages. ) Some viruses contain other ingredients (e. g. , lipids, carbohydrates), but these are derived from their host cells. users. rcn. com/jkimball. ma. ultranet/BiologyPages/V/Virus. users. rcn. com/jkimball. ma. ultranet/BiologyPages/V/Viruses. html. Sophos's software and appliances protect business networks against viruses, spyware, adware, Trojans, spam, and unwanted applications. www. sophos. com/. Embed URL. bb&ob; border-bottom : 1px solid #E2ECF5; &cb;.