YWHAH and ventilator-associated pneumonia: Of the 96 differentially abundant proteins identified in the longitudinal analysis, YWHAH was significantly higher (p < 0.05, 2.4-fold) in VAP Baseline compared with control Baseline. Further comparison of VAP Baseline with other intubation time points in controls showed significant increase of PGK1 (p < 0.05, 2-fold) and NCL (p < 0.05, 2.2-fold) in the VAP Baseline. However, 26 proteins including YWHAH and NCL were not detected in VAP positive but were present in all Baseline (Fig. 3B, Table III).