Question 1

The major difference between infections caused by type b H.influenzae and those infections caused by nontypeable strains is that

Accepted Answer

A) infections caused by type b H.influenzae are often systemic and life- threatening. 
B) infections caused by other Haemophilus spp.occur much less frequently. 
C) the number of type b H.influenzae infections has been greatly reduced. 
D) All of the above are correct. 
E) None of the above are correct. 
A) infections caused by type b H.influenzae are often systemic and life- threatening. 
B) infections caused by other Haemophilus spp.occur much less frequently. 
C) the number of type b H.influenzae infections has been greatly reduced. 
D) All of the above are correct. 
E) None of the above are correct.

Question 2

Among H.influenzae strains, group designations (e.g., type b) are based on

Accepted Answer

A) flagellar antigens. 
B) capsular characteristics. 
C) cell wall antigens. 
D) infectious capabilities. 
A) flagellar antigens. 
B) capsular characteristics. 
C) cell wall antigens. 
D) infectious capabilities.

Question 3

With one exception, species of the genus Haemophilus require which media ingredients for in vitro growth?

Accepted Answer

A) Vitamin K and hemin 
B) Hemin and nicotine adenine dinucleotide (NA
D)  
C) Vitamin K and nicotine adenine dinucleotide (NA
D)  
D) Hemin and cysteine. 
A) Vitamin K and hemin 
B) Hemin and nicotine adenine dinucleotide (NA
D)  
C) Vitamin K and nicotine adenine dinucleotide (NA
D)  
D) Hemin and cysteine.

Question 4

Although a useful test in the past, the particle agglutination assay for detection of H.influenzae type b capsular polysaccharide antigen is no longer reliable due to

Accepted Answer

A) insufficiently high concentration of the organisms in clinical infections. 
B) Lack of sensitivity and specificity of the test procedure. 
C) Frequent use of antimicrobial therapy before collection of the specimen. 
D) Increased use of H.influenzae type b vaccination. 
A) insufficiently high concentration of the organisms in clinical infections. 
B) Lack of sensitivity and specificity of the test procedure. 
C) Frequent use of antimicrobial therapy before collection of the specimen. 
D) Increased use of H.influenzae type b vaccination.

Question 5

Performance of the "factor requirement test" for Haemophilus involves

Accepted Answer

A) inoculation of unsupplemented media with a light suspension of the organism and placement of X and V factor disks on the agar surface. 
B) inoculation of liquid media, unsupplemented and supplemented with X and V factors. 
C) detecting the presence of enzymes that convert d-aminolevulinic acid (AL
A)  into porphyrins. 
D) growth of the organism in the presence of bacterial species that produce X and V factors as metabolic by-products. 
A) inoculation of unsupplemented media with a light suspension of the organism and placement of X and V factor disks on the agar surface. 
B) inoculation of liquid media, unsupplemented and supplemented with X and V factors. 
C) detecting the presence of enzymes that convert d-aminolevulinic acid (AL
A)  into porphyrins. 
D) growth of the organism in the presence of bacterial species that produce X and V factors as metabolic by-products.

Question 6

Match the microscopic morphology with the most likely agent.
-Slender or coccobacillary

Accepted Answer

A) H. haemolyticus 
B) H. influenzae biotype aegypticus 
C) H. influenzae 
D) H. segnis 
E) H. parainfluenzae 
A) H. haemolyticus 
B) H. influenzae biotype aegypticus 
C) H. influenzae 
D) H. segnis 
E) H. parainfluenzae

Question 7

Compared with nontypable strains of Haemophilus spp., choose the statement that is true about infections caused by type b H.influenzae.

Accepted Answer

A) Infections caused by type b H.influenzae are often systemic and life-threatening. 
B) Infections caused by H.influenzae occur much more frequently. 
C) The number of type b H.influenzae infections has been greatly reduced. 
D) All of the above are correct. 
E) None of the above are correct. 
A) Infections caused by type b H.influenzae are often systemic and life-threatening. 
B) Infections caused by H.influenzae occur much more frequently. 
C) The number of type b H.influenzae infections has been greatly reduced. 
D) All of the above are correct. 
E) None of the above are correct.

Question 8

To increase the sensitivity of direct Gram stain examination of body fluid specimens, the specimens usually are

Accepted Answer

A) incubated for 18 to 24 hours before staining. 
B) centrifuged before staining. 
C) examined for at least 1 hour. 
D) stained for an additional 5 minutes. 
A) incubated for 18 to 24 hours before staining. 
B) centrifuged before staining. 
C) examined for at least 1 hour. 
D) stained for an additional 5 minutes.

Question 9

Match the microscopic morphology with the most likely agent.
-Very short bacilli occasionally seen as filamentous forms

Accepted Answer

A) H. haemolyticus 
B) H. influenzae biotype aegypticus 
C) H. influenzae 
D) H. segnis 
E) H. parainfluenzae 
A) H. haemolyticus 
B) H. influenzae biotype aegypticus 
C) H. influenzae 
D) H. segnis 
E) H. parainfluenzae

Exam 31: Haemophilus

The major difference between infections caused by type b H.influenzae and those infections caused by nontypeable strains is that

Among H.influenzae strains, group designations (e.g., type b) are based on

With one exception, species of the genus Haemophilus require which media ingredients for in vitro growth?

Although a useful test in the past, the particle agglutination assay for detection of H.influenzae type b capsular polysaccharide antigen is no longer reliable due to

Performance of the "factor requirement test" for Haemophilus involves

Match the microscopic morphology with the most likely agent. -Slender or coccobacillary

Compared with nontypable strains of Haemophilus spp., choose the statement that is true about infections caused by type b H.influenzae.

To increase the sensitivity of direct Gram stain examination of body fluid specimens, the specimens usually are

Match the microscopic morphology with the most likely agent. -Very short bacilli occasionally seen as filamentous forms

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

Enterobacteriaceae

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

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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