Table 1.

IDSA criteria for severity in community-acquired pneumonia (CAP), based on 2019 guidelines.

IDSA Criteria for Severe CAP. One Major Criteria or Three or More Minor Criteria.
Minor criteria
Respiratory rate > 30 breaths/min PaO2/FIO2 ratio < 250
Multilobar infiltrates
Confusion or disorientation
Uremia (blood urea nitrogen level >20 mg/dL)
Leukopenia (white blood cell count, 4.000 cells/μL due to infection alone
Thrombocytopenia (platelet count, 100.000/μL)
Hypothermia (core temperature, <36 °C)
Hypotension requiring aggressive fluid resuscitation
Major criteria
Septic shock with need for vasopressors
Respiratory failure requiring mechanical ventilation