Prematurity , Birth weights , Intubation and re-intubation , Duration of mechanical ventilation, Suction , Aspiration and nutrition, Modulation of colonization, Systemic antibiotics , Ventilator circuit-related factors. [21] AEtiology infants who developed sepsis pathogens isolated from blood were compared with the organisms isolated from ETA. the same strain of organism has been isolated from the blood and endotracheal tube aspirate cultures(full agreement). the organisms in the blood were found as one of the multiple isolates from the endotracheal tube(partial agreement). same organism was not found in the endotracheal tube aspirate and blood(no agreement )