A patient with severe neurological devastation after head trauma has a prolonged course in the intensive care unit. He has been mechanically ventilated for his entire hospital stay. Which of the following clinical findings is diagnostic of a ventilator-associated pneumonia?
White blood cell count of greater than 12,000/mL Greater than 1,000 colony-forming U/mL of an organism on bronchoalveolar lavage Greater than 10,000 colony-forming U/mL of an organism on bronchoalveolar lavage Purulent tracheal secretions