Season One Edit. Beckett's initial relationship with Castle was strained because she viewed him as immature and reckless. She suspected (correctly) that Castle was using his research as an excuse to pursue her, and only tolerated his presence at the request of Captain Montgomery.
What causes croup in children. Croup in children is most often caused by the parainfluenza virus, a respiratory virus not related to the flu. But it can also be caused by other respiratory viruses including the flu. Yes, croup is contagious.
Croup is an infectious pediatric illness of the respiratory system that involves the vocal cords (larynx), the windpipe (trachea), and the upper airways of the lungs (bronchial tubes). The majority of a child's symptoms reflect involvement of the larynx. Less often croup is caused by bacteria. 2  Croup is contagious, especially during the first few days of illness. 3  A cough that sounds like a barking seal and a harsh raspy Darth Vader sound during inhalation are symptoms of croup.