What is a virus infection?
Viruses are smaller and are not cells. Unlike bacteria, they need a host such as a human or animal to multiply. Viruses cause infections by entering and multiplying inside the body’s healthy cells.
Viral infections are any illness you get from a virus (a small germ that uses your cells to reproduce). Common viral illnesses include colds, the flu, COVID-19, norovirus (“stomach flu”), Epstein-Barr-Virus (EBV), HPV (warts), and herpes simplex virus (cold sores).