CD4 and ventilator-associated pneumonia: Univariate COX survival analysis revealed that 11 variables: hormones, sequential organ failure assessment (SOFA), CD4 T, ThTsCD4CD8, hospital-acquired pneumonia, ventilator-associated pneumonia, pro-procalcitonin, pro-interleukin-6 (IL-6), procalcitonin, IL-6, and duration of mechanical ventilation (DurationMV) were significant risk factors for mortality in AB-infected patients (P < .05).