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 Viruses are very small infectious agents. They’re made from a bit of genetic material, like DNA or RNA, that’s enclosed during a coat of protein.Viruses invade cells in your body and use components of these cells to assist them multiply. This process often damages or destroys infected cells. A viral disease is any illness or health condition caused by an epidemic . Read on to find out more about a number of the most sorts of viral diseases: Not all viral diseases are contagious. this suggests they aren’t always spread from person to person. But many of them are. Common samples of contagious viral diseases include the flu, the cold , HIV, and herpes.Other sorts of viral diseases spread through other means, like the bite of an infected insect. Respiratory viral diseases are contagious and commonly affect the upper or lower parts of your tract . Common symptoms of a respiratory viral disease include: •         runny or stuffy nose •         coughing or sneezing •         fever •         body aches Respiratory viruses are spread by droplets generated through coughing or sneezing. If someone with a viral illness coughs or sneezes nearby and you inhale these droplets, you'll develop the disease. These viruses also can be spread through contaminated objects, like doorknobs, tabletops, and private items. If you touch one among these objects then touch your nose or eyes, you'll develop a disease.148. Viral diseases Research Articles

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