How is croup transmitted?

Updated: Oct 09, 2019
  • Author: Germaine L Defendi, MD, MS, FAAP; Chief Editor: Russell W Steele, MD  more...
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The primary ports of viral entry are the nose and nasopharynx. The infection spreads and eventually involves the larynx and trachea. The lower respiratory tract may also be affected, as in acute laryngotracheobronchitis. Some practitioners feel that with lower airway involvement, further diagnostic evaluation is warranted to address concern for a secondary bacterial infection.

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