Considering the reactions given in this case study, Yersinia enterocolitica would be the best choice.
Most strains of Plesiomonas shigelloides, Escherichia coli, and Pasteurella multocida are urease negative. Also, Plesiomonas shigelloides demonstrates a K/A reaction on a TSI slant.
The stool specimen from a patient admitted to the hospital with symptoms of appendicitis has a culture with the following characteristics:
Gram-negative bacillus
Catalase positive
Urease positive
Weakly fermentative
TSI Slant is A/A
These reactions suggest that the organism is MOST likely:
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