A Patient in the Intensive Care Unit Has Developed Pneumonia

Multiple Choice

A patient in the intensive care unit has developed pneumonia. A sputum culture grows an oxidase-negative, non-lactose fermenter. The organism is demonstrated in the Gram stain below. The microbiologist works up the organism as a member of the Enterobacteriaceae. The next day she realizes her error. The organism displays the following results:
Source: CDC and Dr. W. A. Clark
TSI: K/NC
Motility: negative
OF medium:
Open tubes: glucose: yellow, lactose: yellow, maltose: green
Closed tubes: glucose: green, lactose: green, maltose: green

A) Stenotrophomonas maltophilia.
B) Acinetobacter baumannii.
C) Moraxella lacunata.
D) Pseudomonas fluorescens.