In addition, we found a positive correlation between S100A9 protein and procalcitonin (PCT, Pearson’s r = 0.48 p-value = 0.05) (Fig 1B) as well as sequential organ failure assessment (SOFA) Score at BAL with best Glasgow Coma Scale (GCS, Pearson’s r = 0.50, p-value = 0.04) (Fig 1C) in patients with bacterial pneumonia. The gene discussed is S100A9; the disease is bacterial pneumonia.