ICD-11 definition : A condition commonly caused by an acute viral infection of the upper airway. This
condition is characterized by a barking cough, stridor, hoarseness, or difficulty
breathing. Transmission is commonly by inhalation of infected respiratory secretions.;
A condition commonly caused by an acute viral infection of the upper airway. This
condition is characterized by a barking cough, stridor, hoarseness, or difficulty
breathing. Transmission is commonly by inhalation of infected respiratory secretions.