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 can be caused by allergies bacteria or inhaled irritants but usually it s the result of a virus most of the time the culprit is the parainfluenza virus but other viruses respiratory syncytial virus rsv adenovirus influenza and measles for example can also trigger croup