WorksheetsCSI261
Total questions: 10
Worksheet time: 5mins
Which of the following antigens is located in the cell wall of enteric bacteria?
O antigen
H antigen
K antigen
F antigen
Which strain of Escherichia coli primarily affects infants and children and causes outbreaks in hospital nurseries and day care centers?
Enteroinvasive (EIEC)
Enterohemorrhagic (EHEC)
Enteropathogenic (EPEC)
Enterotoxigenic (ETEC)
A 43-year-old male was seen in the ER and admitted to the ICU. He had positive urine and blood cultures with the same organism which was a gram-negative rod that grew on TSA (BAP) and MAC. It was a lactose fermenter on MAC and looked like E coli, however, it was indole negative.
Other biochemical testing was as follows:
MR positive and VP negative
Urease positive
Citrate positive (it grew on Simmons citrate agar)
H2S positive
Escherichia coli
Enterobacter aerogenes
Klebsiella pneumoniae
Citrobacter freundii
Which organism is an opportunistic pathogen that causes wound and urinary tract infections and may cause the production of kidney stones?
Yersinia enterocolitica
Citrobacter freundii
Proteus mirabilis
Enterobacter cloacea
What is a distinctive characteristic of Proteus species colonies?
They are flat and smooth.
They produce a yellow pigment.
They swarm on non-selective media.
They are motile.
A male older adult, hospitalized and recovering from cardiac bypass surgery, develops pneumonia. Sputum culture reveals a gram-negative rod that produces a green pigment but does not ferment carbohydrates. The most likely organism is:
Klebsiella pneumoniae
Proteus species
Enterobacter species
Pseudomonas aeruginosa
What type of colonies does Salmonella produce on differential selective agar?
Pink, lactose fermenting colonies.
Clear, colorless, lactose fermenting colonies
Clear, colorless, non-lactose fermenting with H2S
Green, non-lactose fermenting colonies
Which group of Shigella species does Shigella dysenteriae belong to?
Group A
Group B
Group C
Group D
Which pigment is produced by Serratia marcescens?
Pyocyanin
Prodigiosin
Melanin
Erytromycin
Which of the following characteristics is TRUE about Edwardsiella tarda?
It ferments sucrose rapidly.
It is indole-negative.
Its produces hydrogen sulfide.
It grows well on Simmons citrate.
