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The majority of upper respiratory tract infections are due to infection with picornaviruses of the rhinovirus group. However other viruses such as adenoviruses, coronaviruses, coxsachie viruses, echoviruses, influenza viruses, para-influenza viruses and the respiratory syncytial virus (RSV) can cause upper respiratory tract infections.
RSV, the influenza viruses, parainfluenza viruses I and II and adenoviruses can also cause acute infection of the larynx, trachea and major bronchi.