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Remember that viruses to stay alive need a live host.

“Viruses lack certain features that other forms of life have. They cannot convert carbohydrates, proteins, or fats into energy, a process called metabolism. They cannot reproduce on their own, but must enter a living cell and use the host cell’s energy.”

Read more: http://www.humanillnesses.com/original/U-Z/Viral-Infections.html#ixzz3GMPoEQNV