Clinical Scenario:
An 8-year-old previously healthy boy presents with a 5-day history of fever, dry cough and progressive lethargy. Over the preceding 24 hours, he has developed increasing breathlessness and poor oral intake.
On examination, his temperature is 38.1°C, respiratory rate 42/min, heart rate 126/min and blood pressure 102/66 mmHg. His SpO₂ is 89% on room air. He has subcostal recession and bilateral fine inspiratory crackles. There is no wheeze, rash, conjunctival injection or abdominal tenderness.
Investigations show Hb 12.6 g/dL, WBC 7.8 × 10⁹/L with lymphocytes 0.9 × 10⁹/L, platelets 246 × 10⁹/L, CRP 86 mg/L and ferritin 720 ng/mL. Chest CT demonstrates bilateral peripheral ground-glass opacities with areas of consolidation. SARS-CoV-2 PCR is positive.
Which of the following best describes this child’s illness?
A. Bacterial bronchopneumonia
B. Mild acute COVID-19
C. Multisystem inflammatory syndrome in children
D. Severe acute COVID-19 pneumonia
E. Viral bronchiolitis
Correct answer & Explanation:
Correct answer: D. Severe acute COVID-19 pneumonia
Explanation
This child has severe acute COVID-19 pneumonia with hypoxaemia.
The important clinical feature is the combination of an acute respiratory illness, SpO₂ of 89% on room air, respiratory distress and bilateral pulmonary infiltrates, together with a positive SARS-CoV-2 PCR. The lymphopenia and elevated inflammatory markers further support significant acute COVID-19.
The presentation is not typical of MIS-C. MIS-C usually develops weeks after SARS-CoV-2 infection and is characterized by fever with prominent extrapulmonary/multisystem involvement, often including gastrointestinal symptoms, rash or conjunctivitis, shock and cardiac dysfunction. This child instead has an acute, predominantly respiratory illness with active SARS-CoV-2 infection.
Bacterial pneumonia remains an important clinical differential, but the bilateral peripheral ground-glass pattern together with the overall presentation is characteristic of COVID-19 pneumonia. A positive SARS-CoV-2 test does not by itself exclude bacterial coinfection, so clinical assessment remains important.
Why the other options are incorrect
- A. Bacterial bronchopneumonia: Possible differential, but the clinical and radiological pattern favors acute COVID-19.
- B. Mild acute COVID-19: Incorrect because the child is significantly hypoxaemic and has respiratory distress.
- C. MIS-C: The timing and phenotype are wrong; there is no clear post-infectious multisystem inflammatory presentation.
- E. Viral bronchiolitis: The child’s age, CT findings and clinical presentation are not typical of bronchiolitis.
Clinical pearl
Acute respiratory-predominant illness + hypoxaemia + pulmonary infiltrates + positive SARS-CoV-2 testing → think severe acute COVID-19.
This is different from:
Weeks after SARS-CoV-2 infection + fever + multisystem inflammation ± shock/cardiac dysfunction → think MIS-C.
WHO’s current living guideline recommends oxygen therapy for hypoxaemic patients with severe or critical COVID-19 and recommends against routine empirical antibiotics when there is low clinical suspicion of bacterial coinfection.
World Health Organization. Clinical management of COVID-19: living guideline, June 2025. Geneva: WHO; 2025. The guideline provides current recommendations for severity assessment, oxygen therapy and management of severe/critical COVID-19.
