Which of the following organisms displays a negative oxidase test?

Direct spread of pneumonic plague disease occurs by which route?

Describe the principle of the MR/VP test.

Which of the following is urease positive?

A characteristic of Yersinia pestis is:

The Voges-Proskauer (VP) test detects which end product of glucose fermentation?

Which of the following organisms produce a positive phenylalanine deaminase (PDA) reaction?

Which species of Shigella is most commonly associated with diarrheal disease in the United States?

Three consecutive stool cultures from a 25 year-old male patient produced little normal fecal flora on MacConkey and Hektoen enteric agars.  Colonies produced on CIN agar displayed “bulls-eye” colonies after 48 hours of incubation.  The patient had been suffering from enterocolitis with fever, diarrhea and abdominal pain for 2 days.  What is the most likely identification of this gram negative rod?

A gram negative rod that is oxidase negative and acquired by eating improperly prepared and cooked or preserved food contaminated with human feces and produces dysentery is: