Laryngotracheobronchitis is caused most commonly by:: (A) Adenovirus, (B) Parainfluenza virus, (C) Rhinovirus, (D) None of the above
Answer is B. 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.