Identify severe community-acquired pneumonia requiring ICU admission using ATS/IDSA 2007 criteria. Major criteria (1 sufficient): invasive mechanical ventilation or septic shock. Minor criteria (>= 3 of 9): RR >= 30, PaO2/FiO2 <= 250, multilobar infiltrates, confusion, BUN >= 20, WBC < 4000, platelets < 100K, temp < 36 C, SBP < 90.
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