Other Non-Pathogenic Opportunistic Enterobacterales

Question 1

Food and fish/water contamination

Answer 1

Edwardsiella tarda

Question 2

May present gastroenteritis and myonecrosis in wound infections

Answer 2

Edwardsiella tarda

Question 3

LDC positive; Non-lactose fermenter; Same IMViC as E. coli: (+,+,-,-); TSI: K/A g+ H2S(+)

Answer 3

Edwardsiella tarda

Question 4

Prodigiosin (red) pigment at 25°C

Answer 4

Serratia marcescens

Question 5

Bacteremia outbreaks in nurseries, cardiac surgery, and burn units

Answer 5

Serratia marcescens

Question 6

DNASE positive in oxidase-negative, gram-negative bacilli

Answer 6

Serratia marcescens

Question 7

Antigens of Proteus vulgaris

Answer 7

OX2, OX19

Question 8

Antigens of Proteus mirabilis

Answer 8

OXK

Question 9

Causative agent for acute glomerulonephritis, urinary tract infection (UTI), kidney stone formation

Answer 9

Proteus

Question 10

Morganella morganii causes

Answer 10

Neonatal sepsis

Question 11

UTI, diarrhea, nosocomial outbreaks in burn patients

Answer 11

Providencia alcalifaciens, Providencia rettgeri, Providencia stuartii

Question 12

PAD positive, urease positive, LDA positive in oxidase-negative, gram-negative bacilli

Answer 12

PMP group - Proteus, Morganella morganii, Providencia alcalifaciens, Providencia rettgeri, Providencia stuartii

Question 13

Currant jelly sputum, capsule (mucoid), some are carbapenemase producers

Answer 13

K. pneumoniae

Question 14

Hospital-acquired pneumonia, ventilator-associated pneumonia, urinary tract infection (UTI), bacteremia

Answer 14

K. pneumoniae

Question 15

Large pink mucoidal colonies in MAC, potassium cyanide (KCN) positive, string test positive

Answer 15

K. pneumoniae

Question 16

Blue safety pin appearance

Answer 16

Klebsiella (Calymmabacterium) granulomatis

Question 17

Granuloma inguinale or Donovanosis (sexually transmitted disease with skin ulcers)

Answer 17

Klebsiella (Calymmabacterium) granulomatis

Question 18

Donovan bodies in endothelial cells

Answer 18

Klebsiella (Calymmabacterium) granulomatis

Question 19

Pneumonia, urinary tract infection, bacteremia

Answer 19

Enterobacter aerogenes, Enterobacter cloacae

Question 20

Potassium cyanide (KCN) and LDC positive

Answer 20

Enterobacter aerogenes, Enterobacter cloacae

Question 21

Can break sialic acid in breast milk and infant formula; Contaminant of powdered infant formula

Answer 21

Cronobacter (Enterobacter) sakazakii

Question 22

Isolated from brain abscess, wound, respiratory infections

Answer 22

Cronobacter (Enterobacter) sakazakii

Question 23

Cronobacter (Enterobacter) sakazakii IMViC

Answer 23

-,-,+,+

Question 24

Nosocomial outbreaks due to contaminated IV fluids

Answer 24

Pantoea (Enterobacter) agglomerans

Question 25

Pantoea (Enterobacter) agglomerans causes

Answer 25

Septicemia

Question 26

Negative TSI reactions but positive glucose fermentation (K/A) in Gram negative, oxidase positive

Answer 26

Pantoea (Enterobacter) agglomerans

Question 27

May be mistaken as Salmonella in biochemical reaction (Citrobacter is LF)

Answer 27

Citrobacter freundii, Citrobacter koseri (C. diversus)

Question 28

Pneumonia, Endocarditis, abdominal abscess in intravenous drug users

Answer 28

Citrobacter freundii

Question 29

Outbreak of neonatal meningitis and brain abscess in nursery units

Answer 29

Citrobacter koseri (C. diversus)

Question 30

Differentiated with indole Citrobacter freundii and C. koseri

Answer 30

C. koseri is positive

Question 31

Differentiated with H2S Citrobacter freundii and C. koseri

Answer 31

C. freundii is positive