This 48 year old man had a long history of alcoholism and was
admitted to the intensive care unit with profound hypotension and
gastrointestinal bleeding. He was intubated and given intravenous
fluids and transfused with packet red blood cells. He remained
intubated and ventilator dependent for several weeks. He developed
fevers and was treated with broad-spectrum antibiotics. Culture of
his tracheal aspirate initially showed Staphylococcus aureus. After
further antibiotic therapy, a gram stain of his tracheal aspirate
showed gram negative rods. His chest radiograph demonstrated an
infiltrate and changes consistent with multiple small abscesses.
Culture of the tracheal aspirate yielded heavy growth of an
oxidase-positive, non-lactose fermenting, gram negative rod that
produced a blue-green water soluble pigment. The causative agent of
this infection is _