Which of the following are expected clinical manifestations of viral croup?

Choice A rationale Stridor is a high-pitched, inspiratory sound resulting from turbulent airflow through a partially obstructed upper airway, specifically the larynx or trachea. In viral croup (laryngotracheobronchitis), inflammation and edema of the subglottic region cause this characteristic narrowing, making stridor a key expected clinical manifestation, especially when the child is agitated or crying. Choice B rationale The barking or "seal-like" cough is the hallmark symptom of viral croup, primarily caused by the inflammation and edema localized to the larynx and vocal cords. The narrowed, swollen subglottic area below the vocal cords creates the distinctive resonant sound as air rushes past the restricted space during exhalation, often worsening at night. Choice C rationale Hoarseness is a direct result of the inflammatory process affecting the vocal cords within the larynx. The edema and irritation cause the vocal cords to vibrate abnormally, altering the voice's pitch and quality, leading to the rough or husky sound that is commonly observed in children with viral croup. Choice D rationale Tripod positioning (sitting upright, leaning forward, with the neck extended) is a compensatory posture typically associated with severe respiratory distress from epiglottitis or a foreign body, indicating imminent airway collapse, but is generally not an expected early finding in the milder upper airway obstruction of viral croup. Choice E rationale Drooling results from the inability to swallow secretions due to severe pain and swelling of the epiglottis, making it a cardinal sign of epiglottitis, a bacterial infection. In contrast, viral croup typically involves inflammation lower down in the subglottic area, so drooling is not an expected clinical feature.