A 26-Year-Old Man Presents with an Infected Foot from Stepping

Multiple Choice

A 26-year-old man presents with an infected foot from stepping on a nail 2 days ago. The nail penetrated through the sole of his tennis shoe. He sprayed some antiseptic on it and did not seek medical help because he had his last tetanus booster about 1 year ago and he thought that would take care of the wound. The foot is quite inflamed around the wound with a little blue-green pus on the bandage. The organism isolated is a Gram-negative rod that is oxidase positive and does not ferment any carbohydrates. Which organism is most likely?

A) Clostridium tetani
B) Escherichia coli
C) Klebsiella pneumoniae
D) Proteus vulgaris
E) Pseudomonas aeruginosa