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 a swelling of the voice box (larynx) and windpipe (trachea). Croup can be caused by allergies, bacteria, or inhaled irritants, but it's usually the result of a virus.Most of the time, the culprit is the parainfluenza virus, but other viruses â respiratory syncytial virus (RSV) , adenovirus, influenza, and measles, for example â can also trigger croup.Croup is most common in children between the ages of 3 months and 5 years, although a child can get croup at any age.The illness shows up most frequently in the colder months â between October and March.roup is most common in children between the ages of 3 months and 5 years, although a child can get croup at any age. The illness shows up most frequently in the colder months â between October and March.