Gram-Negative, Catalase-POSITIVE, Oxidase-NEGATIVE, MAC-POSITIVE Bacilli

Question 1

the only Enterobacteriaceae that is CATALASE NEGATIVE

Answer 1

Shigella dysenteriae

Question 2

the only (common) Enterobacteriaceae that is OXIDASE POSITIVE

Answer 2

Plesiomonas spp.

Question 3

leading cause of community-acquired UTI

leading cause of nosocomial diseases

Answer 3

Escherichia coli

Question 4

the only Enterobacteriaceae that is transmitted from animals by an insect vector

Answer 4

Yersinia pestis

Question 5

the genus that are considered to be the intestinal pathogens

Answer 5

Typhi ang Shigella spp.

Question 6

Enterobacteriaceae that is neither opportunistic pathogen nor intestinal pathogen

Answer 6

Yersinia pestis

– cause of plague

Question 7

genus that are commonly the oppurtunistic pathogens

S P E C K

Answer 7

Citrobacter
Enterobacter
Klebsiella 
Proteus
Serratia 

SPECK

Question 8

the most common clinical manifestations of patients infected with Citrobacter spp

Answer 8

urinary tract infection

Question 9

gene in Citrobacter freundii that codes for ampicillin and cephalosporin (1st gen) resistance

Answer 9

AmpC genes

Question 10

associated in necrotizing colitis in neonates

Answer 10

Cronobacter sakazakii

Question 11

organism that is associated with water harboring fish or turtles

Answer 11

Edwardsiella tarda

Question 12

infections are typically associated with contaminated medical devices

Answer 12

Enterobacter spp. (respirators)

Serratia spp. (urinary catheters)

Question 13

Enterobacteriaceae that are MOTILE lactose fermenters with mucoid colonies

Answer 13

Enterobacter spp

Question 14

major cause of E.coli-associated UTI

Answer 14

UPEC (Uropathogenic E. coli)

– cystits and pyelonephritis

Question 15

cause of neonatal meningitis

Answer 15

MNEC (Meningitis/sepsis-associated E. coli)

Question 16

infection with this organism is usually associated with other underlying diseases such as malignancies

Answer 16

Hafnia alvei

Question 17

the genus that is known to colonize the gastrointestinal tract and the nasopharynx

Answer 17

Klebsiella spp.

Question 18

toxin that has been isolated from patients who have developed a self-limiting antibiotic associates hemorrhagic colitis

Answer 18

heat-labile toxin produced by Klebsiella oxytoca

Question 19

freshwater inhabitant that is transmitted to humans by ingestion of contaminated water or by exposure of disrupted skins

Answer 19

Plesiomonas shigelloides

Question 20

distinct appearance of Proteus spp on culture media

Answer 20

swarming appearance

Question 21

distinct odor of Proteus spp

Answer 21

Chocolate cake odor

burnt chocolate odor

Question 22

organism that can be isolated from wounds and ears

Answer 22

Proteus spp

Question 23

most commonly associated with UTI and feces in CHILDREN

Answer 23

Providencia spp.

Question 24

12th most commonly isolated organism from pediatric patients in North America, Latin America and Europe

Answer 24

Serratia spp.

Question 25

pigment produced by Serratia marcescens that is key identification to laboratorians

Answer 25

prodogiosin (red pigment)

Question 26

identification of this organism is primarily associated with the ability to use citrate as sole source of carbon and lysine for nitrogen with H2S

Answer 26

Salmonella spp.

Question 27

facultative anaerobes that grow from 4C to 43C

Answer 27

Yersinia spp

Question 28

morphology of Y. pestis

Answer 28

safety pin appearance

Question 29

the key chracteristic for rapid diagnosis of the plague (Y. pestis)

Answer 29

methylene blue

Wayson stain

Question 30

stain for Klebsiella granulomatis

Answer 30

scraping lesions stained with Wright’s or Giemsa Stain

Question 31

pathognomonic entity to identify the presence of Klebsiella granulomatis

Answer 31

Donovan bodies

– groups of organisms are seen in mononuclear endothelial cells