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Illustration of different respiratory viruses. Respiratory syncytial virus (RSV, top left) is a common contagious virus that causes infections in the respiratory tract. SARS-CoV-2 (bottom centre) is a contagious virus that travels down the respiratory tract and causes the lining of your respiratory tract to become inflamed and irritated. Influenza (flu, top right) viruses infect the nose, throat, and sometimes the lungs. (KEYSTONE/SCIENCE PHOTO LIBRARY/NIAID/NATIONAL INSTITUTES OF HEALTH/SCIENCE PHOTO LIBRARY)