Enterobacteriaceae Flashcards
The ONPG test is most useful when differentiating:
Shigella from some strains of E coli
In the test for urease production, ammonia reacts to form which product?
Ammonium carbonate
Putrescine is an alkaline amine product of which bacterial enzyme?
Ornithine decarboxylase
Which genera are positive for phenylalanine deaminase?
Morganella, Providencia, and Proteus
Kigler iron agar (KIA) differs from triple-sugar iron agar (TSI) in the:
Use of sucrose in the medium
The malonate test is most useful in differentiating which members of the Enterobacteriaceae family?
Salmonella subgroup 2,3 (the former Arizona)
Which group of tests best identifies the Morganella and Proteus genera?
Motility, urease, and phenylalanine deaminase
Which group of tests best differentiates Enterobacter aerogenes from Edwardsiella tarda?
H2S production, sucrose fermentation, indole, and VP
Cronobacter sakazakii can best be differentiated from Enterobacter cloacae by which of the following characteristics?
Yellow pigmentation and negative sorbitol fermentation
Members of the genus Cedecea are best differentiated from Serratia species by which test result?
Negative DNase
Which of the following organisms is often confused with the Salmonella species biochemically and on plated media?
Citrobacter freundii
A gram negative rod is recovered from a catheterized urine sample from a nursing home patient. The lactose-negative isolate tested positive for indole, urease, ornithine decarboxylase, and phenylalanine deaminase and negative for H2S. The most probable id is:
Morganella
Which single test best separates Klebsiella oxytoca from K pneumo?
Indole
Which organism is transmitted by ingesting undercooked ground beef or raw milk resulting in inflammation and bleeding of the mucosa of the large intestines which can also lead to hemolytic uremic syndrome (HUS)?
E coli (STEC) - shiga toxin
