Question 1

All the following are biochemical features of Salmonella EXCEPT:

Accepted Answer

A)  Lactose positive 
B)  Indole negative 
C)  Hydrogen sulfide positive 
D)  Voges-Proskauer (VP) negative 
A)  Lactose positive 
B)  Indole negative 
C)  Hydrogen sulfide positive 
D)  Voges-Proskauer (VP) negative A

Question 2

All of the following are characteristics of Shigella spp.EXCEPT:

Accepted Answer

A)  Nonmotile 
B)  Urea positive 
C)  Hydrogen sulfide negative 
D)  Lysine decarboxylase negative 
A)  Nonmotile 
B)  Urea positive 
C)  Hydrogen sulfide negative 
D)  Lysine decarboxylase negative B

Question 3

What genus of bacteria is considered an opportunistic pathogen associated with nosocomial outbreaks?

Accepted Answer

A)  Enterobacter 
B)  Serratia 
C)  Proteus 
D)  Escherichia 
A)  Enterobacter 
B)  Serratia 
C)  Proteus 
D)  Escherichia B

Question 4

All of the following are symptoms of salmonellosis that may appear 8 to 36 hours after ingestion of contaminated food EXCEPT:

Accepted Answer

A)  Nausea 
B)  Vomiting 
C)  Headache 
D)  Watery diarrhea 
A)  Nausea 
B)  Vomiting 
C)  Headache 
D)  Watery diarrhea

Question 5

Bacillary dysentery caused by this organism is marked by penetration of intestinal epithelial cells following attachment of the organisms to mucosal surfaces,local inflammation,shedding of the intestinal lining,and formation of ulcers that follow the epithelial penetration.What is this organism?

Accepted Answer

A)  Enterobacter 
B)  Citrobacter 
C)  Shigella 
D)  Salmonella 
A)  Enterobacter 
B)  Citrobacter 
C)  Shigella 
D)  Salmonella

Question 6

In the carrier state,where are pathogenic salmonellae carried?

Accepted Answer

A)  Gallbladder 
B)  Liver 
C)  Intestines 
D)  Stomach 
A)  Gallbladder 
B)  Liver 
C)  Intestines 
D)  Stomach

Question 7

What bacterium is the causative agent of the plague?

Accepted Answer

A)  Salmonella enteritidis 
B)  Citrobacter freundii 
C)  Shigella sonnei 
D)  Yersinia pestis 
A)  Salmonella enteritidis 
B)  Citrobacter freundii 
C)  Shigella sonnei 
D)  Yersinia pestis

Question 8

Which of the following agars is not selective for Enterobacteriaceae?

Accepted Answer

A)  Buffered charcoal yeast extract 
B)  MacConkey 
C)  Hektoen enteric 
D)  Xylose-lysine deoxycholate 
A)  Buffered charcoal yeast extract 
B)  MacConkey 
C)  Hektoen enteric 
D)  Xylose-lysine deoxycholate

Question 9

A microbiologist is reading a stool culture and notices a very moist and mucoid pink colony on MacConkey agar.What is the most likely organism?

Accepted Answer

A)  Klebsiella pneumoniae 
B)  Escherichia coli 
C)  Proteus vulgaris 
D)  Acinetobacter 
A)  Klebsiella pneumoniae 
B)  Escherichia coli 
C)  Proteus vulgaris 
D)  Acinetobacter

Question 10

What two bacteria produce swarming colonies on nonselective media such as sheep blood agar (SBA)?

Accepted Answer

A)  Enterobacter aerogenes and Serratia marcescens 
B)  Proteus pannier and Klebsiella pneumoniae 
C)  Proteus vulgaris and Proteus mirabilis 
D)  Proteus mirabilis and Escherichia coli 
A)  Enterobacter aerogenes and Serratia marcescens 
B)  Proteus pannier and Klebsiella pneumoniae 
C)  Proteus vulgaris and Proteus mirabilis 
D)  Proteus mirabilis and Escherichia coli

Question 11

What organism in the genus Providencia is incriminated in nosocomial outbreaks in burn units and has been isolated from urine cultures?

Accepted Answer

A)  Providencia stuartii 
B)  P. heimbachae 
C)  P. rustigianii 
D)  P. alcalifaciens 
A)  Providencia stuartii 
B)  P. heimbachae 
C)  P. rustigianii 
D)  P. alcalifaciens

Question 12

Why is it that most cases of salmonella food poisoning are not treated with antibiotics?

Accepted Answer

A)  The organisms are very resistant to antibiotics. 
B)  Antibiotics cannot reach the organisms, as they are deeply embedded in the intestinal walls. 
C)  Antibiotics would only kill the bacteria, then release the endotoxins into the blood, making things worse. 
D)  The disease is self-limiting and will subside on its own. 
A)  The organisms are very resistant to antibiotics. 
B)  Antibiotics cannot reach the organisms, as they are deeply embedded in the intestinal walls. 
C)  Antibiotics would only kill the bacteria, then release the endotoxins into the blood, making things worse. 
D)  The disease is self-limiting and will subside on its own.

Question 13

The Escherichia coli serotype O157:H7 is associated with all the following EXCEPT:

Accepted Answer

A)  Hemorrhagic diarrhea 
B)  Colitis 
C)  Liver damage 
D)  Hemolytic-uremic syndrome 
A)  Hemorrhagic diarrhea 
B)  Colitis 
C)  Liver damage 
D)  Hemolytic-uremic syndrome

Question 14

All of the following are categories of diarrheogenic Escherichia coli EXCEPT:

Accepted Answer

A)  ETEC 
B)  EMEC 
C)  EIEC 
D)  EPEC 
A)  ETEC 
B)  EMEC 
C)  EIEC 
D)  EPEC

Question 15

Where are most Salmonella serotypes found?

Accepted Answer

A)  Dogs 
B)  Cold-blood animals (fish) 
C)  Cats 
D)  Horses 
A)  Dogs 
B)  Cold-blood animals (fish) 
C)  Cats 
D)  Horses

Question 16

What organism possesses the Vi antigen?

Accepted Answer

A)  Salmonella serotype Typhi 
B)  S. sonnei 
C)  Shigella sonnei 
D)  Citrobacter freundii 
A)  Salmonella serotype Typhi 
B)  S. sonnei 
C)  Shigella sonnei 
D)  Citrobacter freundii

Question 17

All of the following are members of the Citrobacter genus EXCEPT:

Accepted Answer

A)  Citrobacter freundii 
B)  C. diversus 
C)  C. asteroides 
D)  C. braakii 
A)  Citrobacter freundii 
B)  C. diversus 
C)  C. asteroides 
D)  C. braakii

Question 18

What enteric organism may produce a blue-violet pigment on non-blood-containing media?

Accepted Answer

A)  Kluyvera 
B)  Shigella 
C)  Ewingella 
D)  Cedecea 
A)  Kluyvera 
B)  Shigella 
C)  Ewingella 
D)  Cedecea

Question 19

Escherichia coli strains are associated with all the following properties EXCEPT:

Accepted Answer

A)  Indole production 
B)  Fermentation of glucose and lactose 
C)  Methyl red (MR) positive, Voges-Proskauer (VP) negative 
D)  Can use citrate as a sole carbon source 
A)  Indole production 
B)  Fermentation of glucose and lactose 
C)  Methyl red (MR) positive, Voges-Proskauer (VP) negative 
D)  Can use citrate as a sole carbon source

Question 20

Which organism is the most common cause of urinary tract infections (UTIs)in humans?

Accepted Answer

A)  Escherichia coli 
B)  Klebsiella oxytoca 
C)  Proteus mirabilis 
D)  Enterobacter cloacae 
A)  Escherichia coli 
B)  Klebsiella oxytoca 
C)  Proteus mirabilis 
D)  Enterobacter cloacae

Exam 19: Enterobacteriaceae

All the following are biochemical features of Salmonella EXCEPT:

All of the following are characteristics of Shigella spp.EXCEPT:

What genus of bacteria is considered an opportunistic pathogen associated with nosocomial outbreaks?

All of the following are symptoms of salmonellosis that may appear 8 to 36 hours after ingestion of contaminated food EXCEPT:

Bacillary dysentery caused by this organism is marked by penetration of intestinal epithelial cells following attachment of the organisms to mucosal surfaces,local inflammation,shedding of the intestinal lining,and formation of ulcers that follow the epithelial penetration.What is this organism?

In the carrier state,where are pathogenic salmonellae carried?

What bacterium is the causative agent of the plague?

Which of the following agars is not selective for Enterobacteriaceae?

A microbiologist is reading a stool culture and notices a very moist and mucoid pink colony on MacConkey agar.What is the most likely organism?

What two bacteria produce swarming colonies on nonselective media such as sheep blood agar (SBA)?

What organism in the genus Providencia is incriminated in nosocomial outbreaks in burn units and has been isolated from urine cultures?

Why is it that most cases of salmonella food poisoning are not treated with antibiotics?

The Escherichia coli serotype O157:H7 is associated with all the following EXCEPT:

All of the following are categories of diarrheogenic Escherichia coli EXCEPT:

Where are most Salmonella serotypes found?

What organism possesses the Vi antigen?

All of the following are members of the Citrobacter genus EXCEPT:

What enteric organism may produce a blue-violet pigment on non-blood-containing media?

Escherichia coli strains are associated with all the following properties EXCEPT:

Which organism is the most common cause of urinary tract infections (UTIs)in humans?

Bacterial Cell Structure, physiology, Metabolism, and Genetics

Host-Parasite Interaction

Laboratory Role in Infection Control

Control of Microorganisms

Performance Improvement in the Microbiology Laboratory

Specimen Collection and Processing

Microscopic Examination of Infected Materials

Use of Colonial Morphology for the Presumptive Identification of Microorganisms

Biochemical Identification of Gram-Negative Bacteria

Immunodiagnosis of Infectious Diseases

Applications of Molecular Diagnostics

Antibiotic Mechanisms of Action and Resistance

Antimicrobial Susceptibility Testing

Staphylococci

Streptococcus, enterococcus, and Other Catalase-Negative Gram-Positive Cocci

Aerobic Gram-Positive Bacilli

Neisseria Species and Moraxella Catarrhalis

Haemophilus and Other Fastidious Gram-Negative Bacilli

Vibrio,aeromonas,plesiomonas and Campylobacter Species

Nonfermenting and Miscellaneous Gram-Negative Bacilli

Anaerobes of Clinical Importance

Spirochetes

Chlamydia and Rickettsia

Mycoplasma and Ureaplasma

Mycobacterium Tuberculosis and Other Nontuberculosis Mycobacteria

Medically Significant Fungi

Diagnostic Parasitology

Clinical Virology

Agents of Bioterror

Biofilms: Architects of Disease

Upper and Lower Respiratory Tract Infections

Skin and Soft Tissue Infections

Gastrointestinal Infections and Food Poisoning

Infections of the Central Nervous System

Bacteremia and Sepsis

Urinary Tract Infections

Genital Infections and Sexually Transmitted Diseases

Infections in Special Populations

Zoonotic Diseases

Ocular Infections

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