Croup is most commonly caused by which type of infection?

Croup is most commonly caused by which type of infection?

• A. Bacterial
• B. Parasitic
• C. Fungal
• D. Viral

Answer: (D)

Croup is most commonly caused by viral infections, with parainfluenza viruses being the classic culprits. The virus inflames the larynx and subglottic trachea, leading to a barking cough and inspiratory stridor in young children. Because the cause is viral, the illness is usually managed with supportive care rather than antibiotics and tends to be self-limited. Bacterial infections can mimic croup but are far less common and typically present with higher fever and a more toxic appearance (think bacterial tracheitis or epiglottitis). Parasitic or fungal infections of the airway are rare in healthy children and do not describe the typical presentation of croup.

Croup is most commonly caused by viral infections, with parainfluenza viruses being the classic culprits. The virus inflames the larynx and subglottic trachea, leading to a barking cough and inspiratory stridor in young children. Because the cause is viral, the illness is usually managed with supportive care rather than antibiotics and tends to be self-limited. Bacterial infections can mimic croup but are far less common and typically present with higher fever and a more toxic appearance (think bacterial tracheitis or epiglottitis). Parasitic or fungal infections of the airway are rare in healthy children and do not describe the typical presentation of croup.