Criteria
Disease severity[2]
Mild illness
No hypoxemia. May have mildly increased respiratory rate, but retains ability to feed adequately.
Moderate illness
Hypoxemia (oxygen saturations <90% to 92%), tachypnea, increased work of breathing (nasal flaring, intercostal retractions, head bobbing), inadequate feeding, and dehydration.
Severe illness
Refractory hypoxemia, progressive respiratory distress, or frank respiratory failure.
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