Which of the following organisms is termed “triple decarboxylase negative” and has been implicated in a nationwide outbreak of septicemia from contaminated IV fluid?

Most pathogenic bacteria are:

Biochemically, the Enterobacteriaceae are gram negative rods that:

The prokaryotic members of the microbial world are:

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?