Question 1

All of the following species of Arcanobacterium are clinically significant except:

Accepted Answer

A) Arcanobacterium haemolyticum. 
B) A.pyogenes. 
C) A.bernardiae. 
D) A.urealyticum. 
A) Arcanobacterium haemolyticum. 
B) A.pyogenes. 
C) A.bernardiae. 
D) A.urealyticum. D

Question 2

What are the names of the species of organism that are primarily saprophytic organisms and resemble other aerobic actinomycetes with the morphology and diseases they cause?

Accepted Answer

A) Actinomadura 
B) Saprophytes 
C) Streptomyces 
D) Streptococcus 
A) Actinomadura 
B) Saprophytes 
C) Streptomyces 
D) Streptococcus C

Question 3

What other gram-positive rod is similar to Bacillus anthracis?

Accepted Answer

A) B.subtilis 
B) B.cereus 
C) L.monocytogenes 
D) E.rhusiopathiae 
A) B.subtilis 
B) B.cereus 
C) L.monocytogenes 
D) E.rhusiopathiae B

Question 4

What is the name of the bacteria that plays an important role in the health of the female vaginal tract, protecting it against pathogens?

Accepted Answer

A) Diphtheroids 
B) Gardnerella vaginalis 
C) Erysipelothrix rhusiopathiae 
D) Lactobacillus 
A) Diphtheroids 
B) Gardnerella vaginalis 
C) Erysipelothrix rhusiopathiae 
D) Lactobacillus

Question 5

What is the name of the species that, before the onset of bioterrorism and immunocompromised patients, was considered a common laboratory contaminant?

Accepted Answer

A) Streptococcus 
B) Bacillus 
C) Rhodococcus 
D) Arcanobacterium 
A) Streptococcus 
B) Bacillus 
C) Rhodococcus 
D) Arcanobacterium

Question 6

How can Nocardia spp.be presumptively identified?

Accepted Answer

A) Strong staining with Gram stain and the presence of filamentous, branching organisms 
B) Medusa head colonies with filamentous, branching organisms present on acid-fast stain 
C) Sulfur granules that when crushed and Gram stained reveal filamentous, branching organisms 
D) Filamentous, branching organisms with a carbolfuchsin acid-fast stain with a weak acid decolorizer, but not a Kinyoun acid-fast stain 
A) Strong staining with Gram stain and the presence of filamentous, branching organisms 
B) Medusa head colonies with filamentous, branching organisms present on acid-fast stain 
C) Sulfur granules that when crushed and Gram stained reveal filamentous, branching organisms 
D) Filamentous, branching organisms with a carbolfuchsin acid-fast stain with a weak acid decolorizer, but not a Kinyoun acid-fast stain

Question 7

The symptoms of inhalation anthrax include all of the following except:

Accepted Answer

A) productive cough. 
B) dyspnea. 
C) cyanosis. 
D) disorientation. 
A) productive cough. 
B) dyspnea. 
C) cyanosis. 
D) disorientation.

Question 8

After 24 hours, a sheep blood agar (SBA) from a vaginal culture is read.The SBA has a-hemolytic, pinpoint, rough colonies all over the plate.A catalase test is performed, and it is negative.What organisms do these characteristics fit?

Accepted Answer

A) Lactobacillus and viridans streptococci 
B) Diphtheroids and rhodococci 
C) Staphylococcus and Listeria 
D) Corynebacterium and Arcanobacterium 
A) Lactobacillus and viridans streptococci 
B) Diphtheroids and rhodococci 
C) Staphylococcus and Listeria 
D) Corynebacterium and Arcanobacterium

Question 9

What organism shows diphtheroid gram-positive rods with traces of branching on a Gram stain?

Accepted Answer

A) Rothia dentocariosa 
B) Rhodococcus equi 
C) Listeria monocytogenes 
D) Corynebacterium diphtheriae 
A) Rothia dentocariosa 
B) Rhodococcus equi 
C) Listeria monocytogenes 
D) Corynebacterium diphtheriae

Question 10

What bacterium produces colonies that are nonhemolytic, large, gray, and flat with an irregular margin on sheep blood agar (SBA)?

Accepted Answer

A) Bacillus anthracis 
B) Streptococcus pneumoniae 
C) Nocardia asteroides 
D) Listeria monocytogenes 
A) Bacillus anthracis 
B) Streptococcus pneumoniae 
C) Nocardia asteroides 
D) Listeria monocytogenes

Question 11

What organism displays Babès-Ernst granules on a Gram stain?

Accepted Answer

A) Listeria monocytogenes 
B) Erysipelothrix rhusiopathiae 
C) Rhodococcus equi 
D) Corynebacterium diphtheriae 
A) Listeria monocytogenes 
B) Erysipelothrix rhusiopathiae 
C) Rhodococcus equi 
D) Corynebacterium diphtheriae

Question 12

The symptoms of gastrointestinal anthrax include all the following except:

Accepted Answer

A) abdominal pain. 
B) rice water stools. 
C) bloody diarrhea. 
D) vomiting. 
A) abdominal pain. 
B) rice water stools. 
C) bloody diarrhea. 
D) vomiting.

Question 13

Several people from a picnic came down with a gastrointestinal disturbance, and public health officials suspected a case of food poisoning.The food, especially hot dogs, were cultured and after 24 hours of growth on sheep blood agar (SBA), there was a small, round, smooth, translucent colony surrounded by a narrow zone of b-hemolysis.A Gram stain showed gram-positive coccobacilli.Motility medium was inoculated and an umbrella pattern of motility was observed at room temperature.What organism was isolated as the cause of the illness?

Accepted Answer

A) Listeria monocytogenes 
B) Rhodococcus equi 
C) Rothia dentocariosa 
D) Corynebacterium diphtheriae 
A) Listeria monocytogenes 
B) Rhodococcus equi 
C) Rothia dentocariosa 
D) Corynebacterium diphtheriae

Question 14

What is the name of the iron-chelating compound produced by Nocardia spp.?

Accepted Answer

A) Nocobactin 
B) Novobiocin 
C) Narcalase 
D) Niacin 
A) Nocobactin 
B) Novobiocin 
C) Narcalase 
D) Niacin

Question 15

All the following tests should be performed by sentinel laboratories to rule out the possibility of Bacillus anthracis from an isolate except:

Accepted Answer

A) gram stain. 
B) glucose fermentation. 
C) catalase. 
D) motility. 
A) gram stain. 
B) glucose fermentation. 
C) catalase. 
D) motility.

Question 16

What media does Corynebacterium diphtheriae grow on?

Accepted Answer

A) Sheep blood agar (SB
A)  
B) Loeffler 
C) Cystine-tellurite blood 
D) All of the above 
A) Sheep blood agar (SB
A)  
B) Loeffler 
C) Cystine-tellurite blood 
D) All of the above

Question 17

What is the colony morphology of A.haemolyticum on sheep blood agar (SBA)?

Accepted Answer

A) A narrow zone of b-hemolysis and a black opaque dot is seen when the colony is scraped away 
B) g-Hemolysis, with pitting around the edges of the colony 
C) a-Hemolysis, with a central black opaque dot in the colony 
D) A wide zone of b-hemolysis and a large, yellow, mucoid colony 
A) A narrow zone of b-hemolysis and a black opaque dot is seen when the colony is scraped away 
B) g-Hemolysis, with pitting around the edges of the colony 
C) a-Hemolysis, with a central black opaque dot in the colony 
D) A wide zone of b-hemolysis and a large, yellow, mucoid colony

Question 18

Why is it that although Nocardia spp.grow well on most common nonselective laboratory media, many are missed when the cultures are read?

Accepted Answer

A) These organisms require 3 to 6 days to grow. 
B) These organisms require factors X and V to grow. 
C) These organisms require 3 to 6 weeks to grow. 
D) These organisms are anaerobic. 
A) These organisms require 3 to 6 days to grow. 
B) These organisms require factors X and V to grow. 
C) These organisms require 3 to 6 weeks to grow. 
D) These organisms are anaerobic.

Question 19

What is the major virulence factor associated with Corynebacterium diphtheriae?

Accepted Answer

A) Trypsin 
B) Diphtheria toxin 
C) Diphtheria bacteriophage 
D) Hyaluronidase 
A) Trypsin 
B) Diphtheria toxin 
C) Diphtheria bacteriophage 
D) Hyaluronidase

Question 20

Erysipelothrix rhusiopathiae produces all the following diseases except:

Accepted Answer

A) septicemia. 
B) meningitis. 
C) endocarditis. 
D) erysipeloid. 
A) septicemia. 
B) meningitis. 
C) endocarditis. 
D) erysipeloid.

Exam 16: Aerobic Gram-Positive Bacilli

All of the following species of Arcanobacterium are clinically significant except:

What are the names of the species of organism that are primarily saprophytic organisms and resemble other aerobic actinomycetes with the morphology and diseases they cause?

What other gram-positive rod is similar to Bacillus anthracis?

What is the name of the bacteria that plays an important role in the health of the female vaginal tract, protecting it against pathogens?

What is the name of the species that, before the onset of bioterrorism and immunocompromised patients, was considered a common laboratory contaminant?

How can Nocardia spp.be presumptively identified?

The symptoms of inhalation anthrax include all of the following except:

After 24 hours, a sheep blood agar (SBA) from a vaginal culture is read.The SBA has a-hemolytic, pinpoint, rough colonies all over the plate.A catalase test is performed, and it is negative.What organisms do these characteristics fit?

What organism shows diphtheroid gram-positive rods with traces of branching on a Gram stain?

What bacterium produces colonies that are nonhemolytic, large, gray, and flat with an irregular margin on sheep blood agar (SBA)?

What organism displays Babès-Ernst granules on a Gram stain?

The symptoms of gastrointestinal anthrax include all the following except:

What is the name of the iron-chelating compound produced by Nocardia spp.?

All the following tests should be performed by sentinel laboratories to rule out the possibility of Bacillus anthracis from an isolate except:

What media does Corynebacterium diphtheriae grow on?

What is the colony morphology of A.haemolyticum on sheep blood agar (SBA)?

Why is it that although Nocardia spp.grow well on most common nonselective laboratory media, many are missed when the cultures are read?

What is the major virulence factor associated with Corynebacterium diphtheriae?

Erysipelothrix rhusiopathiae produces all the following diseases except:

Bacterial Cell Structure, Physiology, Metabolism, and Genetics

Host-Parasite 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

Antimicrobial Susceptibility Testing

Staphylococci

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

Neisseria Species and Moraxella Catarrhalis

Haemophilus and Other Fastidious Gram-Negative Bacilli

Enterobacteriaceae

Vibrio, Aeromonas, Plesiomonas, 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 Diseases

Infections in Special Populations

Zoonotic Diseases

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