Laryngotracheobronchitis is caused most commonly by:
Laryngotracheobronchitis is the most common infectious cause of airway obstruction in children, usually occurring between the ages of 6 months and 3 years. It is a viral infection most commonly caused by the parainfluenza virus, although numerous other organisms have been repoed.
Adenovirus
Parainfluenza virus
Rhinovirus
None of the above