Question 1

All of the following are categories of diarrhea-causing Escherichia coli, except

Accepted Answer

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

Question 2

In the carrier state, where are pathogenic salmonella carried?

Accepted Answer

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

Question 3

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 C

Question 4

What bacterium produces swarming colonies on nonselective media, such as sheep blood agar (SBA)?

Accepted Answer

A)  Enterobacter aerogenes 
B)  Klebsiella pneumoniae 
C)  P. mirabilis 
D)  Morganella morganii 
A)  Enterobacter aerogenes 
B)  Klebsiella pneumoniae 
C)  P. mirabilis 
D)  Morganella morganii

Question 5

All of the following are clinically significant isolates of the genus Enterobacter, except

Accepted Answer

A)  Enterobacter cloacae. 
B)  E. aerogenes. 
C)  E. gergoviae. 
D)  E. hartmanni. 
A)  Enterobacter cloacae. 
B)  E. aerogenes. 
C)  E. gergoviae. 
D)  E. hartmanni.

Question 6

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 7

The primary pathogens of the Enterobacteriaceae include all the following, except

Accepted Answer

A)  Salmonella enterica. 
B)  Proteus mirabilis. 
C)  Shigella spp. 
D)  Yersinia spp. 
A)  Salmonella enterica. 
B)  Proteus mirabilis. 
C)  Shigella spp. 
D)  Yersinia spp.

Question 8

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, because 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, because 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 9

A microbiologist is reading stool culture plates. She is looking for enteric pathogens on the MAC plate. What do they look like?

Accepted Answer

A)  Clear, colorless colonies 
B)  Large, bright pink colonies 
C)  Small, mucoid, green colonies 
D)  Small, orange colonies 
A)  Clear, colorless colonies 
B)  Large, bright pink colonies 
C)  Small, mucoid, green colonies 
D)  Small, orange colonies

Question 10

What are the primary antigens used in serologic grouping of salmonellae?

Accepted Answer

A)  Somatic A antigen and flagellar O antigens 
B)  Capsular A antigen and somatic O antigen 
C)  Flagellar H antigen and capsular A antigen 
D)  Flagellar H antigen and somatic O antigen 
A)  Somatic A antigen and flagellar O antigens 
B)  Capsular A antigen and somatic O antigen 
C)  Flagellar H antigen and capsular A antigen 
D)  Flagellar H antigen and somatic O antigen

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

What disease produced by a Salmonella spp. is a severe form of enteric fever?

Accepted Answer

A)  Pontiac fever 
B)  Typhoid fever 
C)  Undulant fever 
D)  Malignant fever 
A)  Pontiac fever 
B)  Typhoid fever 
C)  Undulant fever 
D)  Malignant fever

Question 13

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

Question 14

Which animals are a common source of Salmonella serotypes?

Accepted Answer

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

Question 15

What organism presents as a pink colony with a halo on MAC agar and a green metallic sheen on eosin methylene blue (EMB) agar?

Accepted Answer

A)  Salmonella enterica 
B)  Proteus mirabilis 
C)  Escherichia coli 
D)  Klebsiella pneumonia 
A)  Salmonella enterica 
B)  Proteus mirabilis 
C)  Escherichia coli 
D)  Klebsiella pneumonia

Question 16

A microbiologist is reading stool culture plates. She sees an organism that has a dry, pink colony with a surrounding "halo" of pink on MAC. What is a good presumptive identification of this organism?

Accepted Answer

A)  Enteric pathogen 
B)  Escherichia/Citrobacter-like organism 
C)  Klebsiella/Enterobacter-like organism 
D)  Haemophilus influenzae 
A)  Enteric pathogen 
B)  Escherichia/Citrobacter-like organism 
C)  Klebsiella/Enterobacter-like organism 
D)  Haemophilus influenzae

Question 17

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 18

What is the name of the organism that has been a documented cause of nursery outbreaks of neonatal meningitis and brain abscesses?

Accepted Answer

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

Question 19

A microbiologist is reading stool culture plates. She sees an organism that has a large, mucoid pink colony on MAC. What is a good presumptive identification of this organism?

Accepted Answer

A)  Enteric pathogen 
B)  Escherichia/Citrobacter-like organism 
C)  Klebsiella/Enterobacter-like organism 
D)  Haemophilus influenzae 
A)  Enteric pathogen 
B)  Escherichia/Citrobacter-like organism 
C)  Klebsiella/Enterobacter-like organism 
D)  Haemophilus influenzae

Question 20

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

Accepted Answer

A)  Klebsiella pneumoniae 
B)  Escherichia coli 
C)  Proteus vulgaris 
D)  Yersinia enterocolitica 
A)  Klebsiella pneumoniae 
B)  Escherichia coli 
C)  Proteus vulgaris 
D)  Yersinia enterocolitica

Exam 19: Enterobacteriaceae

All of the following are categories of diarrhea-causing Escherichia coli, except

In the carrier state, where are pathogenic salmonella carried?

What bacterium produces swarming colonies on nonselective media, such as sheep blood agar (SBA)?

All of the following are clinically significant isolates of the genus Enterobacter, except

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

The primary pathogens of the Enterobacteriaceae include all the following, except

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

A microbiologist is reading stool culture plates. She is looking for enteric pathogens on the MAC plate. What do they look like?

What are the primary antigens used in serologic grouping of salmonellae?

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

What disease produced by a Salmonella spp. is a severe form of enteric fever?

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

Which animals are a common source of Salmonella serotypes?

What organism presents as a pink colony with a halo on MAC agar and a green metallic sheen on eosin methylene blue (EMB) agar?

A microbiologist is reading stool culture plates. She sees an organism that has a dry, pink colony with a surrounding "halo" of pink on MAC. What is a good presumptive identification of this organism?

What bacterium is the causative agent of the plague?

What is the name of the organism that has been a documented cause of nursery outbreaks of neonatal meningitis and brain abscesses?

A microbiologist is reading stool culture plates. She sees an organism that has a large, mucoid pink colony on MAC. What is a good presumptive identification of this organism?

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

Bacterial Cell Structure, Physiology, Metabolism, and Genetics

Hostparasite Interaction

The Laboratory Role in Infection Control

Control of Microorganisms

Performance Improvement in the Microbiology Laboratory

Specimen Collection and Processing

Microscopic Examination of Materials From Infected Sites

Use of Colony Morphology for the Presumptive Identification of Microorganisms

Biochemical Identification of Gram-Negative Bacteria

Immunodiagnosis of Infectious Diseases

Applications of Molecular Diagnostics

Antimicrobial Agent Mechanisms of Action and Resistance Mechanisms

Antimicrobial Susceptibility Testing

Staphylococci

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

Aerobic Gram-Positive Bacilli

Neisseria Species and Moraxella Catarrhalis

Haemophilus, Hacek, Legionella, and Other Fastidious Gram-Negative Bacilli

Vibrio, Aeromonas, and Campylobacter Species

Nonfermenting and Miscellaneous Gram-Negative Bacilli

Anaerobes of Clinical Importance

The Spirochetes

Chlamydia, Rickettsia, and Similar Organisms

Mycoplasma and Ureaplasma

Mycobacterium Tuberculosis and Nontuberculous Mycobacteria

Medically Significant Fungi

Diagnostic Parasitology

Clinical Virology

Agents of Bioterror and Forensic Microbiology

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 Infections

Infections in Special Populations

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