Croup, which is usually the result of a viral infection, causes the larynx and trachea to swell, resulting in a deep bark-like cough. It is usually associated with signs of a respiratory infection, such as a runny nose or cough. It is a very common childhood illness.
Most common among children between the ages of 6 months and 3 years, croup not as dangerous today as it once was. Fortunately, present day vaccines for measles, Hib, and diphtheria have eliminated some of the more serious types of croup.
