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An upper respiratory tract infection (URTI) is an illness caused by an acute infection, which involves the upper respiratory tract, including the nose, sinuses, pharynx, larynx or trachea. [ 3 ] [ 4 ] This commonly includes nasal obstruction, sore throat, tonsillitis , pharyngitis , laryngitis , sinusitis , otitis media , and the common cold .
vomiting or diarrhea, which is more common among children. Flu season is upon the U.S., as are other circulating winter respiratory illnesses, such as the common cold and COVID-19.
Stage I is the early infection phase during which the domination of upper respiratory tract symptoms is present. Stage II is the pulmonary phase in which the patient develops pneumonia with all its associated symptoms; this stage is split with Stage IIa which is without hypoxia and Stage IIb which includes hypoxia.
Typical infections of the upper respiratory tract include tonsillitis, pharyngitis, laryngitis, sinusitis, otitis media, certain influenza types, and the common cold. [3] Symptoms of URIs can include cough , sore throat , runny nose , nasal congestion , headache , low-grade fever , facial pressure, and sneezing .
Middle East respiratory syndrome (MERS) is a viral respiratory infection caused by Middle East respiratory syndrome–related coronavirus (MERS-CoV). [1] Symptoms may range from none, to mild, to severe depending on age and risk level. [6] [1] Typical symptoms include fever, cough, diarrhea, and shortness of breath. [1]
Symptoms. Respiratory illnesses like COVID-19 share many common symptoms, such as cough, shortness of breath, fever, achiness, congestion and sore throat. ... with infections increasing in several ...
Pneumonia frequently starts as an upper respiratory tract infection that moves into the lower respiratory tract. [55] It is a type of pneumonitis (lung inflammation). [56] The normal flora of the upper airway give protection by competing with pathogens for nutrients.
For some, COVID-19 symptoms may persist weeks to months after the initial infection. In 2022, 6.9% of US adults reported to have experienced long COVID, according to a CDC survey .