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Enterobacteriaceae Flashcards

1
Q

All enterics are encapsulated except:

A

Klebsiella & Enterobacter

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2
Q

Yersinia is non-motile at ___C but motile at ___C

A

37; 25

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3
Q

Which of the enterics are the true pathogens? (not members of the normal flora)

A

Shigella, Salmonella, Yersinia

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4
Q

All enterics are catalase(+) except:

A

S. dysenteriae

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5
Q

All enterics are oxidase(-) except:

A

P. shigelloides

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6
Q

What are the rapid lactose fermenters?

A

E. coli, Klebsiella, Enterobacter

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7
Q

Also known as somatic antigen

A

O antigen

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8
Q

Common name of Escherichia coli

A

Colon bacillus

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9
Q

E. coli IMVC:

A

++–

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10
Q

Which E. coli virulence factor is responsible for iron chelation?

A

Aerobactin

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11
Q

Common cause of watery diarrhea among adults and children; Traveler’s diarrhea/Montezuma’s revenge

A

Enterotoxigenic E. coli (ETEC)

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12
Q

This heat-labile toxin stimulates adenylate cyclase which increases the conversion of ATP to Camp

A

Enterotoxin A

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13
Q

Camp accumulation leads to ____ of electrolytes and fluids into the intestinal lumen which results to watery diarrhea

A

Hypersecretion

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14
Q

Causative agent of infantile diarrhea

A

Enteropathogenic E. coli (EPEC)

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15
Q

Shigella-like E. coli; causative agent of bloody diarrhea

A

Enteroinvasive E. coli (EIEC)

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16
Q

Also known as Shiga-Toxin E. coli (STEC) or Verocytotoxic E. coli (VTEC)

A

Enterohemorrhagic E. coli (EHEC)

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17
Q

What is the most important strain of E. coli?

A

O157:H7

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18
Q

Phage-encoded cytotoxin identical to Shiga toxin

A

Verotoxin I

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19
Q

Culture media most useful in isolating EHEC (colorless colonies)

A

Sorbitol MacConkey Agar (SMAC)

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20
Q

E. coli which causes diarrhea by adhering to Hep2 cells and are packed in a “stacked brick” pattern

A

Enteroaggregative E. coli (EAEC)

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21
Q

E. coli may have the ability to cause meningitis among neonates if it possesses the ___ antigen.

A

K1

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22
Q

Klebsiella IMVC:

A

–++

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23
Q

TRUE or FALSE: Klebsiella grows in KCN broth.

A

True

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24
Q

Common name of Klebsiella pneumoniae

A

Friedlander’s Bacillus or Bacillus Capsulatus

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25
Q

Causative agent of destructive type of lobar pneumonia

A

Klebsiella pneumoniae

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26
Q

Currant, jelly-like sputum

A

K. pneumoniae

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27
Q

Only indole (+) organism under the genus Klebsiella

A

K. oxytoca

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28
Q

Causes atrophic rhinitis or ozena

A

K. pneumoniae subsp ozaenae

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29
Q

Isolated from patients with rhinoscleroma

A

K. pneumoniae subsp rhinosclermoatis

30
Q

Tests which differentiate between Enterobacter and Klebsiella

A

Motility & ODC

31
Q

Enterobacter IMVC:

32
Q

Only Enterbacter sp that is ADH (+)

A

E. cloacae

33
Q

Only Enterobacter sp that is LDC (-)

A

E. cloacae & E. gergoviae

34
Q

Causative agent of osteomyelitis after traumatic wounds

A

E. cancerogenus

35
Q

Causative agent of meningitis ad bacteremia among neonates; yellow-pigmented colonies

A

Cronobacter sakazakii

36
Q

Causative agent of septicemia due to contaminated IV fluids; triple-decarboxylases (-)

A

Panoea agglomerans

37
Q

Opportunistic pathogens associated with outbreaks in healthcare settings

38
Q

All Serratia sp are slow lactose fermenters, except:

A

S. fonticola

39
Q

Serratia IMVC:

40
Q

Hospital-acquired infections of the urinary or respiratory tract; bacteremic outbreaks in nurseries, cardiac surgery, burn units

A

S. marcescens

41
Q

S. odorifera odor:

A

Rotten potato

42
Q

Linked to HUS, GvHD, sepsis

A

Hafnia alvei

43
Q

Characteristic struvite kidney stones (urease activity)

44
Q

Term for Proteus vegetative cells

45
Q

Proteus odor:

A

Burnt chocolate (gun powder)

46
Q

Providencia IMVC:

47
Q

Causative agent of outbreaks in burn units

A

Providencia stuartii

48
Q

Edwardsiella IMVC:

49
Q

Test that distinguishes E. tarda with E. coli

50
Q

Citrobacter IMVC:

51
Q

Salmonella IMVC:

52
Q

Non-typhoidal fever with or without gastroenteritis

A

Salmonella serotype choleraesuis

53
Q

TRUE or FALSE: S. typhi & S. paratyphi have animal reservoirs.

54
Q

S. typhi virulence antigen; capsular, anti-phagocytic

A

Vi antigen

55
Q

Infective dose of S. typhimurium

56
Q

Specimen of choice during the first week of S. typhi infection:

57
Q

Characteristic scybalous stool

58
Q

____ week of S. typhi infection: rose spots, necrotizing cholecystitis

59
Q

Enteric non-motile at 37C and at 25C

A

Yersinia pestis

60
Q

Y. pseudotuberculosis & Y. enterocolitica are motile at ___C.

61
Q

Y. pestis has a ____ appearance due to bipolar bodies (with Wayson’s stain).

A

Safety pin

62
Q

Yersinia IMVC:

63
Q

Most important virulence factor of Y. pestis

A

Fraction 1

64
Q

Most common form of plague

65
Q

Form of plague where organisms proliferate in the bloodstream and the respiratory tract

66
Q

Y. pestis colonial morphology:

A

Fried egg colonies

67
Q

TRUE or FALSE: Y. enterocolitica survives at cold temperature (4C).

68
Q

Culture media used for Y. enterocolitica

A

Cefsulodin Irgasan Novobiocin (CIN)

69
Q

Y. enterocolitica colonial morphology on CIN:

A

Bull’s eye colonies (red centers due to mannitol fermentation)

70
Q

Caseous swellings that are fatal in animals

A

Pseudotubercles

71
Q

Y. pseudotuberculosis is motile at ___C.

72
Q

Organism acquired through ingestion of undercooked shellfish

A

Plesiomonas shigelloides

Bacteriology (11 decks)

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