A virus is defined as any of a various number of submicroscopic parasites that can infect any animal, plant or bacteria and often lead to very serious or even deadly diseases. A virus consists of a core of RNA or DNA, generally surrounded by a protein, lipid or glycoprotein coat, or some combination of the three. No virus can replicate without the help of a host cell, and though they can be spread, viruses lack the ability of self-reproduction and are not always considered to be living organisms in the regular sense.Some of the most common or best known viruses include the human immunodeficiency virus (HIV), which is the virus that causes AIDS, the herpes simplex virus, which causes cold sores, smallpox, multiple sclerosis, and the human papilloma virus, now believed to be a leading cause of cervical cancer in adult women. The common human cold is also caused by a virus.Since a great deal of mystery still surrounds the origins of most modern viruses, ways to cure these viruses and the diseases they cause are still in the very early stages of development.
Latest about Viruses, Infections & Disease
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The far-reaching impact of certain viruses on the body can make cells grow out of control, causing cancer.
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New device 'zaps' bacteria on the skin, potentially preventing infections
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Nearly 50 illnesses, 1 death caused by E. coli outbreak linked to McDonald's Quarter Pounders
U.S. health officials are investigating a multi-state outbreak of bacterial infections that has been linked to McDonald's Quarter Pounders.
Doctors no longer recommend 'self-checks' for breast cancer — here's what to know
Breast self-exams used to be recommended as a part of routine breast cancer screening. Here's why the guidelines changed and what experts recommend instead.
