Question 1

XLD agar serves which purpose when used in the bacterial fecal culture?

Accepted Answer

A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others 
A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others C

Question 2

Cultures for isolation of Campylobacter jejuni and Campylobacter coli should be incubated in:

Accepted Answer

A)  a capnophilic atmosphere at 42° C and examined at 24 and 48 hours. 
B)  a microaerophilic atmosphere at 35° C and examined at 24 and 48 hours. 
C)  regular room air at 35° C and examined at 48 and 72 hours. 
D)  a microaerophilic atmosphere at 42° C and examined at 24 and 48 hours. 
A)  a capnophilic atmosphere at 42° C and examined at 24 and 48 hours. 
B)  a microaerophilic atmosphere at 35° C and examined at 24 and 48 hours. 
C)  regular room air at 35° C and examined at 48 and 72 hours. 
D)  a microaerophilic atmosphere at 42° C and examined at 24 and 48 hours. D

Question 3

The normal flora of the adult large bowel consists predominantly of:

Accepted Answer

A)  anaerobic species. 
B)  Staphylococcus. 
C)  Enterococcus. 
D)  Enterobacteriaceae. 
A)  anaerobic species. 
B)  Staphylococcus. 
C)  Enterococcus. 
D)  Enterobacteriaceae. A

Question 4

Sheep blood agar serves which purpose when used in the bacterial fecal culture?

Accepted Answer

A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others 
A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others

Question 5

Selenite broth serves which purpose when used in the bacterial fecal culture?

Accepted Answer

A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others 
A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others

Question 6

Gram-negative broth serves which purpose when used in the bacterial fecal culture?

Accepted Answer

A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others 
A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others

Question 7

The transport medium that best preserves the viability of most intestinal bacterial pathogens is:

Accepted Answer

A)  buffered glycerol. 
B)  rectal culture swab. 
C)  Cary-Blair. 
D)  Campylobacter thioglycollate broth. 
A)  buffered glycerol. 
B)  rectal culture swab. 
C)  Cary-Blair. 
D)  Campylobacter thioglycollate broth.

Question 8

Stool received for routine culture in most clinical laboratories in the United States should be examined for the presence of at least:

Accepted Answer

A)  Campylobacter, Salmonella, and Shigella spp. 
B)  Salmonella and Shigella spp. 
C)  Campylobacter and Vibrio spp. 
D)  Salmonella, Shigella, and Vibrio spp. 
A)  Campylobacter, Salmonella, and Shigella spp. 
B)  Salmonella and Shigella spp. 
C)  Campylobacter and Vibrio spp. 
D)  Salmonella, Shigella, and Vibrio spp.

Question 9

MacConkey agar serves which purpose when used in the bacterial fecal culture?

Accepted Answer

A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others 
A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others

Question 10

Campylobacter thioglycollate broth serves which purpose when used in the bacterial fecal culture?

Accepted Answer

A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others 
A)  Evaluation of general flora and predominant species 
B)  Selection of enteric pathogens such as Salmonella, Aeromonas, and others 
C)  Inhibition of normal flora and selection of enteric pathogens 
D)  Enrichment for enteric pathogens such as Salmonella and others

Exam 74: Gastrointestinal Tract Infections

XLD agar serves which purpose when used in the bacterial fecal culture?

Cultures for isolation of Campylobacter jejuni and Campylobacter coli should be incubated in:

The normal flora of the adult large bowel consists predominantly of:

Sheep blood agar serves which purpose when used in the bacterial fecal culture?

Selenite broth serves which purpose when used in the bacterial fecal culture?

Gram-negative broth serves which purpose when used in the bacterial fecal culture?

The transport medium that best preserves the viability of most intestinal bacterial pathogens is:

Stool received for routine culture in most clinical laboratories in the United States should be examined for the presence of at least:

MacConkey agar serves which purpose when used in the bacterial fecal culture?

Campylobacter thioglycollate broth serves which purpose when used in the bacterial fecal culture?

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 and 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

Erysipelothrix Lactobacillus and Similar Organisms

Nocardia Streptomyces Rhodococcus and Similar Organisms

Enterobacteriaceae

Acinetobacter, Stenotrophomonas, and Other Organisms

Pseudomonas, Burkholderia, and Similar Organisms

Rhizobium, Ochrobactrum, and Similar Organisms

Chryseobacterium, Sphingobacterium, and Similar Organisms

Alcaligenes, Bordetella Nonpertussis, Comamonas, and Similar Organisms

Vibrio, Aeromonas, Chromobacterium, and Related Organisms

Sphingomonas Paucimobilis and Similar Organisms

Moraxella and Related Organisms

Eikenella and Similar Organisms

Pasteurella and Similar Organisms

Actinobacillus, Aggregatibacter, Kingella, Cardiobacterium, Capnocytophaga, and Similar Organisms

Haemophilus

Bartonella and Afipia

Campylobacter, Arcobacter, and Helicobacter

Legionella

Brucella

Bordetella Pertussis, Bordetella Parapertussis, and Related Species

Francisella

Streptobacillus Moniliformis and Spirillum Minus

Neisseria and Moraxella Catarrhalis

Overview and General Considerations

Overview of Anaerobic Organisms

Mycobacteria

Obligate Intracellular and Non-culturable Bacterial Agents

Cell Walldeficient Bacteria: Mycoplasma and Ureaplasma

The Spirochetes

Laboratory Methods for Diagnosis of Parasitic Infections: Overview

Intestinal Protozoa

Blood and Tissue Protozoa

Other Protozoa

Intestinal Nematodes Roundworms

Tissue Nematodes Roundworms

Blood and Tissue Filarialnematodes

Intestinal Cestodes

Tissue Cestodes

Intestinal Trematodes

Liver and Lung Trematodes

Blood Trematodes

Overview of Fungal Identification Methods and Strategies

Hyaline Molds, Mucorales Zygomycetes, Dermatophytes, and Opportunitistic and Systemic Mycoses

Dematiaceous Melanizedmolds

Opportunistic Atypical Fungus: Pneumocystis Jiroveci

The Yeasts

Anti-fungal Susceptibility Testing, Therapy, and Prevention

Overview of the Methods and Strategies in Virology

Viruses in Human Disease

Antiviral Therapy, Susceptibility Testing, and Prevention

Bloodstream Infections

Infections of the Lower Respiratory Tract

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