Fig. 2. ( Top row ) Scanning electron microscopy image of standard endotracheal tube (ETT) and using the Mucus Shaver after 72 h of mechanical ventilation. Note absence of bacteria. ( Middle row ) Scanning electron microscopy image of a new vinyl ETT, as received. ( Bottom row ) Scanning electron microscopy image of a standard ETT after 72 h of mechanical ventilation and standard ETT suctioning. Note confluence of erythrocytes and bacteria at highest magnification. ( Left column ) Oblique scanning of cut edges in ETT, ×60. ( Middle column ) Surface of ETT, ×110. ( Right column ) Surface of ETT, ×1,300.