What is a viral infection of the upper respiratory tract?

A viral infection of the upper respiratory tract primarily affects the nose and throat, commonly manifesting as illnesses such as the common cold or influenza. These infections are caused by various viruses, including rhinoviruses, coronaviruses, and influenza viruses. Symptoms often include a runny nose, sore throat, cough, and fever. While most viral upper respiratory infections are mild and self-limiting, they can sometimes lead to more serious complications, especially in vulnerable populations.