CD4 and ventilator-associated pneumonia: The results of the univariate Cox survival analysis revealed that 11 variables: hormones, SOFA score, CD4 T, ThTsCD4CD8, hospital-acquired pneumonia (HAP), ventilator-associated pneumonia (VAP), pro-PCT, pro-IL6, PCT, IL-6, and duration of mechanical ventilation (DurationMV) were identified as risk factors for mortality in patients with AB infection (P < .05), as shown in Table 1.