Non-lactose fermenting strains of Citrobacter freundii may be confused with Salmonella.  The two can be distinguished by:

An isolate of Escherichia coli recovered from a stool of a patient with severe, bloody diarrhea should be tested for fermentation of which sugar before sending it to a reference laboratory for additional identification?

Which of the following tests best differentiates Shigella species from Escherichia coli?

Anaerobes cannot perform respiration because O2 cannot be used as a final electron acceptor.

Three blood cultures taken from a 30 year-old patient receiving chemotherapy and admitted with a urinary tract infection grew lactose-negative, motile, gram negative rods prior to antibiotic therapy.  Given the following reactions, what is the most likely organism present?    TSI = A/A H2S +                                 Indole = Pos MR = Pos                                            VP = Neg Phenylalanine deaminase = Pos             Urease = Pos Citrate = Neg                                     Gelatin hydrolysis = Pos

The majority of clinical laboratories with a microbiology department should have the capability of serotyping which pathogenic Enterobacteriaceae?

A potentially fatal infection called hemolytic uremic syndrome can be a complication following infection with:

Escherichia coli strains are associated with all of the following properties except:

The ortho-nitrophenyl-B-galactopuranoside (ONPG) test is most useful when differentiating:

Which Enterobacter species usually produces a yellow pigment?