Which condition is considered a lower respiratory tract infection?

Infectious mononucleosis, often caused by the Epstein-Barr virus, primarily affects lymphatic tissues and is characterized by symptoms such as fever, sore throat, and lymphadenopathy. While it can cause respiratory symptoms, it is not classified as a lower respiratory tract infection, as it primarily involves upper respiratory and lymphatic systems.

Allergic rhinitis, also known as hay fever, is an allergic response affecting the nasal passages. Symptoms include sneezing, runny nose, and itchy eyes, indicating an upper respiratory condition. Since it does not involve the lungs, it is not considered a lower respiratory tract infection.

Epiglottitis is an inflammation of the epiglottis that can obstruct the airway and is typically caused by infections, including bacterial infections. While it poses serious complications, it primarily affects the upper respiratory tract and not the lower respiratory tract, thus disqualifying it from being categorized as such.