This document summarizes information about cough from Feigin & Cherry's Textbook of Pediatric Infectious Diseases. It classifies cough based on anatomy, etiology, age, and whether it involves the upper or lower respiratory tract. For the upper respiratory tract, common causes are viral infections like RSV, adenovirus, and rhinovirus or bacterial infections such as H. influenzae and S. pyogenes. For the lower respiratory tract, main causes include viral and bacterial pneumonia. Signs differ between upper vs lower respiratory tract infections.