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.
There are several viruses that can cause croup. Seventy-five percent of cases come from parainfluenza viruses (the common cold). Other viruses that may cause croup include adenovirus (another group of common cold viruses), respiratory syncytial virus (RSV), the most common germ affecting young children, and measles.Croup may also be caused by allergies, exposure to inhaled irritants, or bacterial infections.ther viruses that may cause croup include adenovirus (another group of common cold viruses), respiratory syncytial virus (RSV), the most common germ affecting young children, and measles.