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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?

Most members of Enterobacteriaceae are:

What is the expected appearance of E. coli O157:H7 colonies on the screening media used specifically to recover it?

A stool specimen contained an enteric that produced green colonies on HE. Upon typing the organism, the tech noted that no reactions occurred when the organism was mixed with Shigella antisera Groups A-D. What is the best action?

Which battery of media would be best for urine or wound cultures when a Proteus mirabilis is suspected?

The gram negative bacillus was recovered from a urine of a child with recurring UTIs. It was oxidase negative, lactose negative, phenylalanine positive and indole positive. The most likely identification is:

Shigella sonnei is suspected in a nursery outbreak of diarrhea. Which test result would most likely be wrong for Shigella sonnei?

An enteric isolated from a sputum produced mucoid, purple colonies on EMB that produced a pink color when tested with DMAC spot indole reagent. The most likely pathogen:

What rapid test should be done next on the isolate to rule in or out E. coli?

Acinetobacter baumannii is different from Pseudomonas aeruginosa because Acinetobacter is: