- Asymptomatic or mild respiratory illness
- This was not typical during the outbreak
- Moderate respiratory illness
- Temperature of > 100.4°F (>38°C), and
- One or more clinical findings of respiratory illness (e.g., cough, shortness of breath, difficulty breathing or hypoxia).
- Severe respiratory illness
- Temperature of > 100.4°F (>38°C), and
- One or more clinical findings of respiratory illness (e.g., cough, shortness of breath, difficulty breathing, or hypoxia), and
- Radiographic evidence of pneumonia, or
- Respiratory distress syndrome, or
- Autopsy findings consistent with pneumonia or respiratory distress syndrome without an identifiable cause
- AND appropriate epidemiologic findings[2]
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