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Any illness caused by viruses is referred to as a viral infection (a small germ that reproduces in your cells). Common viral illnesses include colds, the flu, norovirus (stomach flu), HPV (warts), and the herpes simplex virus (cold sores). Many viruses are harmless, but others can be fatal or cause chronic illness.What is a viral infection?Viral infections are illnesses caused by tiny organisms that replicate in your cells (viruses). The most common cause of respiratory and digestive illnesses is viruses. Viruses, on the other hand, ... more