A 67-year-old with septic shock from pneumonia is intubated and on norepinephrine. Which diagnostic step is indicated before or at antibiotic initiation according to CAP guidance for severe disease?AObtain sputum Gram stain/culture and two blood cultures prior to antibiotics if feasibleBNo cultures unless prior MRSA colonizationCUse serum procalcitonin to decide whether to give antibioticsDDelay antibiotics until sputum culture obtainedERoutine follow-up chest radiograph at 1-2 weeks in allCheck my answer