BOC Microbiology Questions and Answers
Verified by Experts
Which genera of the Enterobacteriaceae are known to cause diarrhea and are considered
enteric pathogens? Escherichia, Salmonella, Shigella, and Yersinia
An isolate of E.coli recovered from the stool of a patient with severe bloody diarrhea should be
tested for which sugar before sending it to a reference laboratory for serotyping? Sorbitol
(fermentation)
Care must be taken when identifying biochemical isolates of Shigella because serological cross
reactions occur with: E. coli
Which species of Shigella is most commonly associated with diarrheal disease in the united
states? S. sonnei
Which of the following tests best differentiates Shigella species from E. coli? Lactose,
indole, ONPG, and motility (Shigella is negative for all)
, Which genera of Enterobacteriaceae ae usually nonmotile at 36C? Shigella, Klebsiella,
and Yersinia
Fever, abdominal cramping, watery stools, and fluid and elecrolyte loss preceded by bloody
stools 2-3 days before is characteristic of shigellosis, but may also result from infection with:
Campylobacter spp.
Cold enrichment of feces (incubation at 4C) in phosphate-buffered saline prior to subculture
onto enteric media enhances the recovery of: Yersinia enterocolitica
Which group of tests, along with colonial morphology on primary media, aids most in the rapid
identification of the Enterobacteriaceae? Indole, oxidase, MacConkey, and Blood agar
plates
A routine, complete stool culture procedure should include media for the isolation of E. coli
O157:H7 as well as: Salmonella, Shigella, Yersinia, Campylobacter and Staphylococcus
aureus.
Verified by Experts
Which genera of the Enterobacteriaceae are known to cause diarrhea and are considered
enteric pathogens? Escherichia, Salmonella, Shigella, and Yersinia
An isolate of E.coli recovered from the stool of a patient with severe bloody diarrhea should be
tested for which sugar before sending it to a reference laboratory for serotyping? Sorbitol
(fermentation)
Care must be taken when identifying biochemical isolates of Shigella because serological cross
reactions occur with: E. coli
Which species of Shigella is most commonly associated with diarrheal disease in the united
states? S. sonnei
Which of the following tests best differentiates Shigella species from E. coli? Lactose,
indole, ONPG, and motility (Shigella is negative for all)
, Which genera of Enterobacteriaceae ae usually nonmotile at 36C? Shigella, Klebsiella,
and Yersinia
Fever, abdominal cramping, watery stools, and fluid and elecrolyte loss preceded by bloody
stools 2-3 days before is characteristic of shigellosis, but may also result from infection with:
Campylobacter spp.
Cold enrichment of feces (incubation at 4C) in phosphate-buffered saline prior to subculture
onto enteric media enhances the recovery of: Yersinia enterocolitica
Which group of tests, along with colonial morphology on primary media, aids most in the rapid
identification of the Enterobacteriaceae? Indole, oxidase, MacConkey, and Blood agar
plates
A routine, complete stool culture procedure should include media for the isolation of E. coli
O157:H7 as well as: Salmonella, Shigella, Yersinia, Campylobacter and Staphylococcus
aureus.
