Is influenza A a risk factor for severe croup?

Updated: Oct 09, 2019
  • Author: Germaine L Defendi, MD, MS, FAAP; Chief Editor: Russell W Steele, MD  more...
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Infection with influenza A is associated with severe respiratory disease, as it has been detected in children with marked respiratory compromise. The bacterial pathogen, Mycoplasma pneumoniae, has also been identified in a few cases of croup. [5] Prior to 1970, diphtheria, also known as membranous croup, was a common cause of croup-like symptoms. Vaccine coverage for diphtheria has eliminated this infection with no case reported in the United States for decades.

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