Croup is usually deemed to be due to a viral infection. [2][4] Others use the term more broadly, to include acute laryngotracheitis (laryngitis and tracheitis together), spasmodic croup, laryngeal … · Croup is usually caused by a viral infection, most often a parainfluenza virus. Your child may get a virus by breathing infected respiratory droplets coughed or sneezed into the air. · Croup is a very contagious respiratory infection that affects babies and young children. Croup causes a distinctive cough that kind of sounds like a barking seal. Croup is most common in children younger than 5, with the peak age around 2. Croup occurs most often in winter. Croup is a common childhood illness that causes swelling in the upper airway. This can cause a change in voice and characteristic “croupy” cough that sounds like a seal or bark.
