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Enterobacteriaceae Flashcards

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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
Causative agent of destructive type of lobar pneumonia
Klebsiella pneumoniae
26
Currant, jelly-like sputum
K. pneumoniae
27
Only indole (+) organism under the genus Klebsiella
K. oxytoca
28
Causes atrophic rhinitis or ozena
K. pneumoniae subsp ozaenae
29
Isolated from patients with rhinoscleroma
K. pneumoniae subsp rhinosclermoatis
30
Tests which differentiate between Enterobacter and Klebsiella
Motility & ODC
31
Enterobacter IMVC:
--++
32
Only Enterbacter sp that is ADH (+)
E. cloacae
33
Only Enterobacter sp that is LDC (-)
E. cloacae & E. gergoviae
34
Causative agent of osteomyelitis after traumatic wounds
E. cancerogenus
35
Causative agent of meningitis ad bacteremia among neonates; yellow-pigmented colonies
Cronobacter sakazakii
36
Causative agent of septicemia due to contaminated IV fluids; triple-decarboxylases (-)
Panoea agglomerans
37
Opportunistic pathogens associated with outbreaks in healthcare settings
Serratia
38
All Serratia sp are slow lactose fermenters, except:
S. fonticola
39
Serratia IMVC:
--++
40
Hospital-acquired infections of the urinary or respiratory tract; bacteremic outbreaks in nurseries, cardiac surgery, burn units
S. marcescens
41
S. odorifera odor:
Rotten potato
42
Linked to HUS, GvHD, sepsis
Hafnia alvei
43
Characteristic struvite kidney stones (urease activity)
Proteus
44
Term for Proteus vegetative cells
Swimmers
45
Proteus odor:
Burnt chocolate (gun powder)
46
Providencia IMVC:
++-+
47
Causative agent of outbreaks in burn units
Providencia stuartii
48
Edwardsiella IMVC:
++--
49
Test that distinguishes E. tarda with E. coli
H2S
50
Citrobacter IMVC:
-+-+
51
Salmonella IMVC:
-+-+
52
Non-typhoidal fever with or without gastroenteritis
Salmonella serotype choleraesuis
53
TRUE or FALSE: S. typhi & S. paratyphi have animal reservoirs.
False
54
S. typhi virulence antigen; capsular, anti-phagocytic
Vi antigen
55
Infective dose of S. typhimurium
10^6
56
Specimen of choice during the first week of S. typhi infection:
Blood
57
Characteristic scybalous stool
S. typhi
58
____ week of S. typhi infection: rose spots, necrotizing cholecystitis
2nd-3rd
59
Enteric non-motile at 37C and at 25C
Yersinia pestis
60
Y. pseudotuberculosis & Y. enterocolitica are motile at ___C.
25C
61
Y. pestis has a ____ appearance due to bipolar bodies (with Wayson's stain).
Safety pin
62
Yersinia IMVC:
-+--
63
Most important virulence factor of Y. pestis
Fraction 1
64
Most common form of plague
Bubonic
65
Form of plague where organisms proliferate in the bloodstream and the respiratory tract
Pneumonic
66
Y. pestis colonial morphology:
Fried egg colonies
67
TRUE or FALSE: Y. enterocolitica survives at cold temperature (4C).
True
68
Culture media used for Y. enterocolitica
Cefsulodin Irgasan Novobiocin (CIN)
69
Y. enterocolitica colonial morphology on CIN:
Bull's eye colonies (red centers due to mannitol fermentation)
70
Caseous swellings that are fatal in animals
Pseudotubercles
71
Y. pseudotuberculosis is motile at ___C.
18-22C
72
Organism acquired through ingestion of undercooked shellfish
Plesiomonas shigelloides

Bacteriology (11 decks)

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