Enterobacteriaceae Flashcards
All enterics are encapsulated except:
Klebsiella & Enterobacter
Yersinia is non-motile at ___C but motile at ___C
37; 25
Which of the enterics are the true pathogens? (not members of the normal flora)
Shigella, Salmonella, Yersinia
All enterics are catalase(+) except:
S. dysenteriae
All enterics are oxidase(-) except:
P. shigelloides
What are the rapid lactose fermenters?
E. coli, Klebsiella, Enterobacter
Also known as somatic antigen
O antigen
Common name of Escherichia coli
Colon bacillus
E. coli IMVC:
++–
Which E. coli virulence factor is responsible for iron chelation?
Aerobactin
Common cause of watery diarrhea among adults and children; Traveler’s diarrhea/Montezuma’s revenge
Enterotoxigenic E. coli (ETEC)
This heat-labile toxin stimulates adenylate cyclase which increases the conversion of ATP to Camp
Enterotoxin A
Camp accumulation leads to ____ of electrolytes and fluids into the intestinal lumen which results to watery diarrhea
Hypersecretion
Causative agent of infantile diarrhea
Enteropathogenic E. coli (EPEC)
Shigella-like E. coli; causative agent of bloody diarrhea
Enteroinvasive E. coli (EIEC)
Also known as Shiga-Toxin E. coli (STEC) or Verocytotoxic E. coli (VTEC)
Enterohemorrhagic E. coli (EHEC)
What is the most important strain of E. coli?
O157:H7
Phage-encoded cytotoxin identical to Shiga toxin
Verotoxin I
Culture media most useful in isolating EHEC (colorless colonies)
Sorbitol MacConkey Agar (SMAC)
E. coli which causes diarrhea by adhering to Hep2 cells and are packed in a “stacked brick” pattern
Enteroaggregative E. coli (EAEC)
E. coli may have the ability to cause meningitis among neonates if it possesses the ___ antigen.
K1
Klebsiella IMVC:
–++
TRUE or FALSE: Klebsiella grows in KCN broth.
True
Common name of Klebsiella pneumoniae
Friedlander’s Bacillus or Bacillus Capsulatus
Causative agent of destructive type of lobar pneumonia
Klebsiella pneumoniae
Currant, jelly-like sputum
K. pneumoniae
Only indole (+) organism under the genus Klebsiella
K. oxytoca
Causes atrophic rhinitis or ozena
K. pneumoniae subsp ozaenae