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Medical Microbiology Exam 2 > Enterobacteriaceae > Flashcards

Enterobacteriaceae Flashcards

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Biology 101 flashcards USMLE® Step 1 flashcards
1
Q

Escherichia

A

Indole: +
MR: +
VP: -
Citrate: -
TSI: A/AG
Urease: -
Lactose: F
Decarboxylase: L+
MUG: +
ONPG:

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2
Q

Klebsiella

A

Indole: -
MR: -
VP: +
Citrate: +
TSI:A/AG
Urease: +
Lactose: F
Decarboxylase: L+,O-
MUG:+
ONPG: +

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3
Q

Citrobacter

A

Indole: -/+
MR: +
VP: -
Citrate: +
TSI: A/AG +H2S
Urease: V
Lactose: F
Decarboxylase: L-,O-
MUG:
ONPG:

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4
Q

Serratia

A

Indole: -
MR: v
VP: v
Citrate: +
TSI: A/A(+/-G)
Urease: +
Lactose:F
Decarboxylase:
MUG:
ONPG:

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5
Q

Enterobacter

A

Indole: -
MR: -
VP: +
Citrate: +
TSI: A/A (+/-G)
Urease: -
Lactose: F
Decarboxylase: TN
MUG:
ONPG:

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6
Q

Pantoea

A

Lactose: F

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7
Q

Salmonella

A

Indole: -
MR: +
VP: -
Citrate: -
TSI: K/AG + H2S
Urease: -
Lactose: NF
Decarboxylase: L+
MUG: -
ONPG: -

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8
Q

Shigella

A

Indole: v
MR: +
VP: -
Citrate: -
TSI: K/A
Urease: -
Lactose: NF
Decarboxylase: L- (O+S, S. sonnie)
MUG:
ONPG: (S. sonnie +)

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9
Q

Proteus

A

Indole: P. vulgaris (+), P. mirabilis (-)
MR: +
VP: -
Citrate: (-,v) and (+,v)
TSI: K/A + H2S
Urease: +strong
Lactose: NF
Decarboxylase: O+ (P.miabilis)
MUG:
ONPG:

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10
Q

Morganella

A

Indole: +
MR: +
VP: -
Citrate: -
TSI: K/AG
Urease: +
Lactose: NF
Decarboxylase:
MUG:
ONPG:

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11
Q

Providencia

A

Indole: +
MR: -
VP: -
Citrate: +
TSI: K/A (+/-G)
Urease: -
Lactose: NF

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12
Q

Yersinia Pestis

A

Indole: -
MR: +
VP: -
Citrate: -
TSI: K/K
Urease: -
Lactose: NF
Decarboxylase: O-

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13
Q

E. coli

A

-Virulence factors: Endotoxins (LPS – Lipid A + O polysaccharide (surface antigen)), K antigen (polysaccharide capsule), H antigen, Pili, cytotoxin, and enterotoxins
-Opportunistic pathogen (UTI, wound, bacteremia or septicemia, nosocomial infections

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14
Q

Klebsiella Disease

A

-Virulence factors: Nosocomial infections (UTI, bacteremia, septicemia, bronchitis, pneumonia, cardiovascular, wound, ear, nose, and throat infections)
-Chronic granulomatous diseases of upper resp. tract by K. rhinoscleromatis and K. ozaenae, rhinoscleroma, atrophic rhinitis

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15
Q

Pantoea and Enterobacter

A

Nosocomial infections (UTI, blood stream, lower resp., cardio vasc., CNS, wound, ear, nose/throat infections)

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16
Q

Citrobacter

A

-affects hospital patients
-C. freundii: (nosocomial infections - UTI, wound infections, pneumonia, septicemia, meningitis
-C. amalonaticus: UTI, septicemia
-C. koseri: UTIS, septicemia, pneumonia, wound infections, meningitis for children

17
Q

Salmonella

A

-virulence factors: pili, h antigen, endotoxin, capsular virulence (Vi) antigen
*S. enterica & S. bongori
*In US, S. enterica serotypes typhimurium and
enteritidis
-DISEASE: Salmonellosis (diarrhea, fever, and abdominal cramps) and Typhoid fever ( bloodstream infections with high fever and headache, death by septic shock)
-Less common: osteomyelitis, UTIs, and septicemia in immunocompromised patients

18
Q

Shigella

A

-Virulence Factors: Surface proteins (invasion plasmid antigens); shiga toxin & enterotoxins by S. dysenteriae
-similar to E. coli
-Four serogroups: S. dysenteriae (A), S. flexneri (B), S. boydii(C), and S. sonneri (D)
-DISEASE: dysentery
-Shiga toxin causes hemolytic-uremic syndrome

19
Q

Proteus

A

-Virulence factors: : fimbriae, flagella, outer membrane proteins, LPS, capsule antigen, urease, IgA proteases, hemolysis, amino acid deaminases, swarming growth
-DISEASES: UTI, pneumonia, wound infections, septicemia, meningitis
-P. mirabilis commonly isolated

20
Q

Morganella

A

-Virulence factors: fimbrial adhesins, LPS, IgA proteases, hemolysis, ureases
-Causes: nosocomial infections, UTIS, resp. tract., genitourinary tract, wound infections, septicemia, diarrhea, meningitis

21
Q

Providencia

A

-Virulence Factors: motility, adherence, invasion
-DISEASE: cause infections in debilitated patients, UTI pneumonia, postoperative wounds, burn wounds, septicemia, meningitis

22
Q

Yersinia

A

-Virulence factors: adhesins, F-1 antigen (capsular antigen), coagulase, fibrinolysis.
-Y. enterocolitica produces enterotoxin
-DISEASE:
*enterocolitis (bloody diarrhea) and mesenteric adenitis, diarrhea, abdominal pain, fever, polyarthritis, septicemia, wound infections, meningitis
*Y. pestis: plague (black death): pneumonic plague, bubonic plague, septicemic plague
*Y. pseudotuberculosis: rarely infects humans, localized GI infections, scarlet fever-like disease, with high fever, arthritis, and rash. Endotoxemia sometimes occurs.

23
Q

Serratia

A

-Virulence Factors: : Biofilm formation, proteases, flagella, pili, fimbriae, LPS, etc
-DISEASE: Nosocomial infections UTIs, respiratory tract, eye, postoperative wound infections, otitis externa, septicemia, endocarditis, arthritis, osteomyelitis, and meningitis, most
common is S. marcescens

24
Q

What is common among all Enterobacteriaceae?

A

Almost all Catalase and Nitrate positive, and Oxidase negative

Medical Microbiology Exam 2 (3 decks)

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