Could you explain what is a childrens disease called croup caused by?

Parainfluenza virus: Usually true 'croup' is caused by parainfluenza b virus. This is usually self limiting disease which causes inflammation of the voice box and treated by cool steam and in severe cases by corticosteroid injection. Differential diagnosis is more important, cause it might be mistaken with epiglotitis which is life threatening and caused by bacteria. Shahzeidi, md.

Viral illness: Croup is usually viral illness affecting upper airway that is self limited. Most cases of viral croup are mild and can be treated at home. Usually with barking type of cough. Should consult physician to evaluate child for degree of respiratory difficulty and confirm diagnosis. Sometimes necessary to add steroids to albuterol and humidifier therapy if difficulty breathing.