in Breathing and Respiration (Respiratory System) by

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Viruses are the most frequent cause of upper respiratory illnesses while bacteria are responsible for the majority of community and hospital acquired pneumonia in adults.

Common disorders of upper respiratory tract/URTI:
  • Acute coryza/Common cold/rhinitis
  • Sinusitis
  • Laryngitis
  • Acute laryngo-tracheobronchitis/croup/whooping cough
  • Acute epiglottitis.