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Croup is most commonly caused by a viral respiratory infection that is easily passed among children. Common viral causes include parainfluenza (responsible for the majority of infections), influenza, adenovirus, respiratory syncytial virus (RSV), and rhinovirus. Prior to the vaccine era, diphtheria caused most cases of croup and was referred to as membranous croup, but today, fortunately, vaccination against diphtheria has made it an exceedingly rare disease.
Medically Reviewed by a Doctor on 6/20/2014
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