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Viruses cause a number of diseases in eukaryotes. In humans, smallpox, the common cold, chickenpox, influenza, shingles, herpes, polio, rabies, Ebola, hanta fever, and AIDS are examples of viral diseases. Even some types of cancer -- though definitely not all -- have been linked to viruses.
Viruses can enter the human body through any of its openings, but most often they use the nose and mouth. Once inside, the virus attaches itself to the outside of the kind of cell it attacks, called a host cell.he new viruses can destroy their host cells and then move on to attack new host cells. An individual adenovirus viewed under an electron microscope. Viruses are so small that they could not be seen until the electron microscope was invented in the 1940s. This one was photographed at 800,000 times its original size.