Question 1

The gram-negative bacillus that can be described as oxidase-negative, nitrate-positive, and H₂S-positive is

Accepted Answer

A) E Edwardsiella spp. 
B) Shigella vulgaris. 
C) Enterobacter aerogenes. 
D) Escherichia coli. 
E) Shigella sonnei. 
A) E Edwardsiella spp. 
B) Shigella vulgaris. 
C) Enterobacter aerogenes. 
D) Escherichia coli. 
E) Shigella sonnei. A

Question 2

Alkaline slant, acid butt, no H₂S

Accepted Answer

A) Salmonella species 
B) Escherichia coli 
C) Proteus species 
D) Pseudomonas species 
A) Salmonella species 
B) Escherichia coli 
C) Proteus species 
D) Pseudomonas species B

Question 3

MacConkey-sorbitol agar is useful for detecting pathogenic strains of

Accepted Answer

A) Escherichia coli. 
B) Shigella species. 
C) Salmonella species. 
D) Vibrio species. 
A) Escherichia coli. 
B) Shigella species. 
C) Salmonella species. 
D) Vibrio species. A

Question 4

The gram-negative bacillus that can be described as oxidase-negative, nitrate-positive, indole-negative, citrate-positive, methyl red-positive, urease-negative, H₂S-positive is

Accepted Answer

A) Klebsiella pneumoniae. 
B) Proteus vulgaris. 
C) Salmonella enteritidis. 
D) Escherichia coli. 
E) Shigella sonnei. 
A) Klebsiella pneumoniae. 
B) Proteus vulgaris. 
C) Salmonella enteritidis. 
D) Escherichia coli. 
E) Shigella sonnei.

Question 5

The swarming gram-negative bacillus that can be described as oxidase-negative, nitrate-positive, indole-negative, and H₂S- positive is

Accepted Answer

A) Proteus aerogenes. 
B) Proteus vulgaris. 
C) Proteus mirabilis 
D) Escherichia coli. 
A) Proteus aerogenes. 
B) Proteus vulgaris. 
C) Proteus mirabilis 
D) Escherichia coli.

Question 6

The swarming gram-negative bacillus that can be presumptively identified based on a positive indole test is

Accepted Answer

A) Klebsiella pneumoniae. 
B) Proteus vulgaris. 
C) Enterobacter aerogenes. 
D) Escherichia coli. 
E) Shigella sonnei. 
A) Klebsiella pneumoniae. 
B) Proteus vulgaris. 
C) Enterobacter aerogenes. 
D) Escherichia coli. 
E) Shigella sonnei.

Question 7

The serotype O157:H7 of which of the following bacterial species is associated with a serious diarrheal illness with high mortality rates among some populations?

Accepted Answer

A) Escherichia coli 
B) Shigella species 
C) Salmonella species 
D) Vibrio species 
A) Escherichia coli 
B) Shigella species 
C) Salmonella species 
D) Vibrio species

Question 8

Indole production, methyl red, Voges-Proskauer, citrate, urease, oxidase, H₂S production, and gelatin liquefaction are tests historically performed on a

Accepted Answer

A) gram-negative bacillus. 
B) gram-negative coccus. 
C) gram-positive coccus. 
D) gram-positive bacillus. 
E) All of the above are correct. 
A) gram-negative bacillus. 
B) gram-negative coccus. 
C) gram-positive coccus. 
D) gram-positive bacillus. 
E) All of the above are correct.

Question 9

Most strains of Escherichia coli can be presumptively identified based on which characteristic?

Accepted Answer

A) Indole positive 
B) Citrate positive 
C) Methyl red negative 
D) Urease positive 
E) All of the above are true. 
A) Indole positive 
B) Citrate positive 
C) Methyl red negative 
D) Urease positive 
E) All of the above are true.

Question 10

The major etiologic agent of urinary tract infections is

Accepted Answer

A) Escherichia coli. 
B) Shigella species. 
C) Salmonella species. 
D) Vibrio species. 
A) Escherichia coli. 
B) Shigella species. 
C) Salmonella species. 
D) Vibrio species.

Question 11

Enterotoxigenic and enteroinvasive are terms often linked to which of the following bacterial species?

Accepted Answer

A) Escherichia coli 
B) Salmonella enteritidis 
C) Shigella sonnei 
D) Yersinia pestis 
E) All of the above are correct. 
A) Escherichia coli 
B) Salmonella enteritidis 
C) Shigella sonnei 
D) Yersinia pestis 
E) All of the above are correct.

Question 12

Not only is this group of gram-negative bacteria considered normal flora of the gastrointestinal tract of humans and animals, but also it contains agents of important diseases such as gastroenteritis and enteric fevers, urinary tract infections, and bacterial pneumonia.

Accepted Answer

A) Neisseriaceae 
B) Micrococcaceae 
C) Enterococcus 
D) Enterobacteriaceae 
A) Neisseriaceae 
B) Micrococcaceae 
C) Enterococcus 
D) Enterobacteriaceae

Question 13

Choose the bacterial family that is best described as catalase-positive, oxidase-negative, gram-negative bacilli that are facultative anaerobes and most of which reduce nitrates to nitrites.

Accepted Answer

A) Enterobacteriaceae 
B) Micrococcaceae 
C) Pseudomonas 
D) Haemophilus 
A) Enterobacteriaceae 
B) Micrococcaceae 
C) Pseudomonas 
D) Haemophilus

Question 14

Acid slant, acid butt, no H₂S

Accepted Answer

A) Salmonella species 
B) Escherichia coli 
C) Proteus species 
D) Pseudomonas species 
A) Salmonella species 
B) Escherichia coli 
C) Proteus species 
D) Pseudomonas species

Question 15

The first biochemical test that is performed on a gram-negative bacillus growing on MacConkey agar to determine the identification scheme is the

Accepted Answer

A) catalase test. 
B) oxidase test. 
C) urease test. 
D) indole test. 
A) catalase test. 
B) oxidase test. 
C) urease test. 
D) indole test.

Question 16

Which of the following bacteria are etiologic agents of foodborne gastroenteritis in the United States?

Accepted Answer

A) Shigella species 
B) Salmonella species 
C) Yersinia enterocolitica 
D) Escherichia coli 
E) All of the above are correct. 
A) Shigella species 
B) Salmonella species 
C) Yersinia enterocolitica 
D) Escherichia coli 
E) All of the above are correct.

Exam 19: Enterobacteriaceae

The gram-negative bacillus that can be described as oxidase-negative, nitrate-positive, and H₂S-positive is

Alkaline slant, acid butt, no H₂S

MacConkey-sorbitol agar is useful for detecting pathogenic strains of

The gram-negative bacillus that can be described as oxidase-negative, nitrate-positive, indole-negative, citrate-positive, methyl red-positive, urease-negative, H₂S-positive is

The swarming gram-negative bacillus that can be described as oxidase-negative, nitrate-positive, indole-negative, and H₂S- positive is

The swarming gram-negative bacillus that can be presumptively identified based on a positive indole test is

The serotype O157:H7 of which of the following bacterial species is associated with a serious diarrheal illness with high mortality rates among some populations?

Indole production, methyl red, Voges-Proskauer, citrate, urease, oxidase, H₂S production, and gelatin liquefaction are tests historically performed on a

Most strains of Escherichia coli can be presumptively identified based on which characteristic?

The major etiologic agent of urinary tract infections is

Enterotoxigenic and enteroinvasive are terms often linked to which of the following bacterial species?

Not only is this group of gram-negative bacteria considered normal flora of the gastrointestinal tract of humans and animals, but also it contains agents of important diseases such as gastroenteritis and enteric fevers, urinary tract infections, and bacterial pneumonia.

Choose the bacterial family that is best described as catalase-positive, oxidase-negative, gram-negative bacilli that are facultative anaerobes and most of which reduce nitrates to nitrites.

Acid slant, acid butt, no H₂S

The first biochemical test that is performed on a gram-negative bacillus growing on MacConkey agar to determine the identification scheme is the

Which of the following bacteria are etiologic agents of foodborne gastroenteritis in the United States?

Microbial Taxonomy

Bacterial Genetics Metabolism and Structure

Host-Microorganism Interactions

Laboratory Safety

Specimen Management

Role of Microscopy

Traditional Cultivation and Identification

Nucleic Acid-Based Analytic Methods for Microbial Identification and Characterization

Immunochemical Methods Used for Organism Detection

Serologic Diagnosis of Infectious Diseases

Principles of Antimicrobial Action Resistance

Laboratory Methods and Strategies for Antimicrobial Susceptibility Testing

Staphylococcus, Micrococcus, and Similar Organisms

Streptococcus, Enterococcus, and Similar Organisms

Bacillus and Similar Organisms

Listeria, Corynebacterium, and Similar Organisms

Erysipelothirix, Lactobacillus, and Similar Organisms

Nocardia, Streptomyces, Rhodococcus, Oerskovia, and Similar Organisms

Acinetobacter, Stenotrophomonas, and Other Organisms

Pseudomonas, Burkholderia, and Similar Organisms

Achromobacter, Rhizobium, Ochrobactrum, and Similar Organisms

Chryseobacterium, Sphingobacterium, and Similar Organisms

Alcaligenes, Bordetella Nonpertussis, Comamonas, and Similar Organisms

Vibrio, Aeromonas, Plesiomonas Shigelloides, and Chromobacterium Violaceum

Sphingomonas Paucimobilis and Similar Organisms

Moraxella

Eikenella Corrodens and Similar Organisms

Pasteurella and Similar Organisms

Actinobacillus, Kingella, Cardiobacterium, Capnocytophaga, and Similar Organisms

Haemophilus

Bartonella and Afipia

Campylobacter, Arcobacter, and Helicobacter

Legionella

Brucella

Bordetella Pertussis and Bordetella Parapertussis

Francisella

Streptobacillus Moniliformis and Spirillum Minus

Neisseria and Moraxella Catarrhalis

Overview and General Considerations

Laboratory Considerations

Mycobacteria

Obligate Intracellular and Nonculturable Bacterial Agents

Cell Wall-Deficient Bacteria: Mycoplasma and Ureaplasma

The Spirochetes

Laboratory Methods for Diagnosis of Parasitic Infections

Laboratory Methods in Basic Mycology

Laboratory Methods in Basic Virology

Bloodstream Infections

Infections of the Lower Respiratory Tract

Upper Respiratory Tract Infections and Other Infections of the Oral Cavity and Neck

Meningitis and Other Infections of the Central Nervous Systems

Infections of the Eyes, Ears, and Sinuses

Infections of the Urinary Tract

Genital Tract Infections

Gastrointestinal Tract Infections

Skin, Soft Tissue, and Wound Infections

Normally Sterile Body Fluids, Bone and Bone Marrow, and Solid Tissues

Laboratory Physical Design, Management, and Organization

Quality in the Clinical Microbiology Laboratory

Infection Control

Sentinel Laboratory Response to Bioterrorism New

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