The main symptom is sever cough, with phlegm and mucus. Sometimes the mucus may be blood-stained. Other symptoms of a lower respiratory tract infection include:
A tight feeling in your chest
Breathlessness
Wheezing
Sore throat
Headaches
Chills and fever
Aches and pains
Irritability and lethargy
Vomiting along with cough
Blocked nose and sinuses
Causes
These infections are caused by bacteria, viruses or fungi. Viruses causing respiratory infections are highly contagious. And they disperse readily via direct contact.
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