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Croup refers to an infection of the upper airway, which obstructs breathing and causes a characteristic barking cough.
The cough and other signs and symptoms of croup are the result of swelling around the voice box (larynx), windpipe (trachea) and bronchial tubes (bronchi). When a cough forces air through this narrowed passageway, the swollen vocal cords produce a noise similar to a seal barking. Likewise, taking a breath often produces a high-pitched whistling sound (stridor).
Causes
Croup is usually caused by a viral infection, most often a parainfluenza virus.
Your child may contract a virus by breathing infected respiratory droplets coughed or sneezed into the air. Virus particles in these droplets may also survive on toys and other surfaces. If your child touches a contaminated surface and then touches his or her eyes, nose or mouth, an infection may follow.
Symptoms
Croup often begins as a typical cold. If there's enough inflammation and coughing, a child will develop:
Croup typically occurs in younger children. Croup usually isn't serious and most children can be treated at home.