Ch (7) Flashcards
Mention the 7 bacteria that consider as Opportunistic pathogens from the family of Enterobacteriaceae
Escherichia coli
Klebsiella pneumoniae
Enterobacter aerogenes
Serratia marcescens
Proteus spp.
Providencia spp.
Citrobacter spp.
Mention the 4 bacteria that consider as Obligate pathogens from the family of Enterobacteriaceae
Salmonella spp.
Shigella spp.
Yersinia spp.
Some E. coli strains
Which one of the following bacteria have smaller capsule (Klebsiella spp.) or (Enterobacter)
(Enterobacter)
Klebsiella spp. have large capsule
Enterobacter have smaller capsule;
Which of the following bacteria is motile Klebsiella spp. or Proteus species
Proteus species
move very actively by means of
peritrichous flagella, resulting in
“swarming” on solid medium
What is the result of Cytochrome oxidase for Enterobacteriaceae
negative
What is the Breathing method of Enterobacteriaceae
Facultative anaerobes
Which of the following statements is true about Enterobacteriaceae
Ability to oxide nitrates to nitrites
Ability to reduce nitrates to nitrites
Ability to reduce nitrites to nitrates
Ability to oxide nitrites to nitrates
Ability to reduce nitrates to nitrites
Mention the 4 genera from the family of Enterobacteriaceae that can ferment lactose
Escherichia, Klebsiella, Citrobacter and Enterobacter. They are collectively called coliforms
Mention the 4 genera from the family of Enterobacteriaceae that can’t ferment lactose
Salmonella, Shigella, Yersinia and Proteus
Which of the following antigens consider as heat-stable and resistant to alcohol
O antigens (somatic)
H antigens (flagellar)
K antigens (capsular)
O antigens (somatic antigen)
Which of the following antigens considers as Heat-labile and denatured by alcohol
O antigens
H antigens
K antigens
H antigens
The Flagellin antigen
Give an example of selective differential media for Enterobacteriaceae
MacConkey agar
Case study. A patient suffers from diarrhoea, and after tests it was discovered that the cause of the disease is E. coli or other opportunistic Enterobacteriaceae. What is the appropriate treatment that you recommend?
only symptomatic relief
because antibiotic treatment may prolong the fecal carriage or
increase the risk of secondary complications
Case study. A patient suffers from bacteremia and septic shock, and after tests it was discovered that the cause of the disease is E. coli or other opportunistic Enterobacteriaceae. What is the appropriate treatment that you recommend?
prompt antibiotic treatment, restoration of fluid and electrolyte balance
Mention the bacteria that consider as leading causes of meningitis in infants.
E . coli (particularly K1 strains) and S. agalactiae
What’s the bacteria that considered as the most common cause of urinary tract infection.
E.coli
Mention the strain of E.coli that is the major causal agent of Traveler’s diarrhea.
Enterotoxigenic E. coli (ETEC)
Mention the strain of E.coli that causes infant diarrhea in poor countries.
Enteropathogenic E. coli (EPEC)
Mention the strain of E.coli that causes dysentery-like
diarrhea and it’s closely related to Shigella
Enteroinvasive E. coli (EIEC)
Mention the strain of E.coli that causes chronic diarrhea and growth retardation in infants in developing countries.
Enteroaggregative E. coli (EAEC)
What is the most common strains from E.coli that produce diseases in developed countries.
Enterohemorrhagic E. coli (EHEC)
Mention the strain of E.coli that is associated with hemorrhagic colitis and hemolytic uremic syndrome (HUS)
Enterohemorrhagic E. coli (EHEC)
Which of the following is the serotype that is the most common isolated from Enterohemorrhagic E. coli (EHEC)
O157:H7
O152:H6
O157:H6
O152:H7
O157:H7
Verotoxin or Shiga toxin produced by which of the following bacteria
Enterotoxigenic E. coli
Enteropathogenic E. coli
Enterohemorrhagic E. coli
Enteroinvasive E. coli
Enteroaggregative E. coli
Enterohaemorrhagic E. coli
What is the colour of colonies of E.coli when cultures on MacConkey’s medium.
rose-pink colonies
Yellow colonies on XLD and CLED agar
Which of the following statements is true about E.coli
Ferment glucose, lactose, maltose, mannite, sucrose and salicin with production of alcohol
Ferment glucose, lactose, maltose, mannite, sucrose and salicin with production of acid and gas
Ferment glucose, lactose, maltose, mannite, sucrose and salicin with production of acid and no gas
Ferment glucose, lactose, maltose, mannite, sucrose and salicin with production of gas and no acid
Ferment glucose, lactose, maltose, mannite, sucrose and salicin with production of acid and gas.
Right the biochemical activity of E.coli for each of the following
Indol
MR
Motility
VP
Citrate
Indol +
MR +
Motility +
VP -
Citrate -
Mention the genus of Enterobacteriaceae that cause traveller’s diarrhea
Providencia
What is the most common species of proteus that cause UTI
Proteus mirabilis
What is the only specie from proteus that gives Indole negative
Proteus mirabilis
