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.
Quick Answers. 1  Croup is an illness of the respiratory system. 2  Croup can be caused by either a viral or bacterial infection. 3  Croup can cause a barking cough and troubled breathing.  Croup is contagious. It can be spread through sneezing, coughing, and direct 1  contact. Inhaling moist air can help your child breathe easier.