Lower respiratory tract infection and upper respiratory tract infection. HUMAN BIOLOGY
Nervous system
Cardiovascular system
Respiratory system
Digestive system
Immune system
Lower respiratory tract infections: What to know
Symptoms
Upper vs. lower respiratory tract infections
Causes and risk factors
Diagnosis
Treatment
Recovery time
Prevention
Complications
Outlook
Lower respiratory tract infections are any infections in the lungs or below the voice box. These include pneumonia, bronchitis, and tuberculosis.
A lower respiratory tract infection can affect the airways, such as with bronchitis, or the air sacs at the end of the airways, as in the case of pneumonia.
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