QUESTIONS 53-55 REFER TO THE FOLLOWING INFORMATION:An isolate from a stool culture produced the following results: MacConkey: Colorless Citrate: Positive TSI: K/A H2S+ Hektoen: Blue/ Black centers Lysine: Positive Indole – What is the most likely pathogen?

What would be the expected appearance of the colonies on EMB?

What test should be done next to identify it?

The best way to store a urine that cannot be plated within 2 hours:

Salmonella is distinguished from Citrobacter because Salmonella is:

The best option for storing a stool specimen for routine, aerobic culture that cannot be plated on an 8 hour shift:

Gastritis may be caused by Helicobacter and Plesiomonas.

Upon further testing, the isolate produced the following results: VP- Urea- Indole + Lysine + Ornitihine+ Citrate-What is the most likely pathogen?

Observe the following Salmonella serotyping results and determine the most likely species.                                                           Antisera   Before boiling:    Polyvalent        Vi              Group D                        –                   +                  –   After boiling:       Polyvalent        Vi              Group D                                              +                  —                  +  

Campylobacter is oxidase positive and catalase negative.