In P-CAP patients, plasma LCN2 concentration was significantly higher in patients with bacteremia than in patients with negative blood cultures (285.6 ng/mL (122.0–393.6) vs. 94.1 ng/mL (57.2–166.6), respectively; p = 0.005) and in patients with positive PCR- lytA in blood compared with those with negative PCR (273.9 ng/mL (169.0–368.1) vs. 96.4 ng/mL (62.5–202.5), respectively; p = 0.04) (Figure 2). Here, LCN2 is linked to bacterial infectious disease with sepsis.