Question 1

If a person has had tuberculosis during his or her lifetime,how likely is it that the person will get the disease again?

Accepted Answer

A)  5% to 15% 
B)  20% to 25% 
C)  1% 
D)  50% 
A)  5% to 15% 
B)  20% to 25% 
C)  1% 
D)  50%

Question 2

Decontaminating agents used in the decontamination-digestion process include all of the following EXCEPT:

Accepted Answer

A)  Sodium hydroxide 
B)  N-acetyl-1-cysteine 
C)  Benzalkonium chloride 
D)  Hydrochloric acid 
A)  Sodium hydroxide 
B)  N-acetyl-1-cysteine 
C)  Benzalkonium chloride 
D)  Hydrochloric acid

Question 3

Middlebrook 7H10 and 7H11 media are enriched with all of the following EXCEPT:

Accepted Answer

A)  Oleic acid 
B)  Bovine albumin 
C)  Heme 
D)  Beef catalase 
A)  Oleic acid 
B)  Bovine albumin 
C)  Heme 
D)  Beef catalase

Question 4

A patient with Hodgkin's disease is feeling bad,so he pays a visit to his physician.The physician's clinical examination reveals submandibular lymphadenitis,subcutaneous nodules,painful swellings,ulcers progressing to abscesses,and draining fistulas.What organism is probably producing these symptoms?

Accepted Answer

A)  Mycobacterium tuberculosis 
B)  M. avium 
C)  M. gordonae 
D)  M. haemophilum 
A)  Mycobacterium tuberculosis 
B)  M. avium 
C)  M. gordonae 
D)  M. haemophilum

Question 5

What Mycobacterium species fails to grow in vitro?

Accepted Answer

A)  Mycobacterium tuberculosis 
B)  M. leprae 
C)  M. avium 
D)  M. marinum 
A)  Mycobacterium tuberculosis 
B)  M. leprae 
C)  M. avium 
D)  M. marinum

Question 6

What component of mycobacteria is used for identification in the nucleic acid hybridization assays?

Accepted Answer

A)  DNA 
B)  Ribosomal RNA 
C)  Transfer RNA 
D)  Messenger RNA 
A)  DNA 
B)  Ribosomal RNA 
C)  Transfer RNA 
D)  Messenger RNA

Question 7

How long does it take to detect Mycobacterium spp.with the BACTEC method?

Accepted Answer

A)  Less than 2 weeks 
B)  3 weeks 
C)  4 weeks 
D)  6 weeks 
A)  Less than 2 weeks 
B)  3 weeks 
C)  4 weeks 
D)  6 weeks

Question 8

What is the purpose of the digestion-decontamination processing of specimens submitted for mycobacterial culture?

Accepted Answer

A)  To release all bacteria in the sample 
B)  To make the specimen easier to plate 
C)  To allow chemical decontaminants to kill nonmycobacterial organisms 
D)  To liquefy the outer cell wall of the mycobacteria so that they will grow faster 
A)  To release all bacteria in the sample 
B)  To make the specimen easier to plate 
C)  To allow chemical decontaminants to kill nonmycobacterial organisms 
D)  To liquefy the outer cell wall of the mycobacteria so that they will grow faster

Question 9

What is the optimum growth time for most mycobacteria associated with disease?

Accepted Answer

A)  2 to 6 weeks 
B)  1 to 2 weeks 
C)  5 to 7 days 
D)  3 to 5 days 
A)  2 to 6 weeks 
B)  1 to 2 weeks 
C)  5 to 7 days 
D)  3 to 5 days

Question 10

The Centers for Disease Control and Prevention (CDC)recommends all the following drugs for the treatment of Mycobacterium tuberculosis EXCEPT:

Accepted Answer

A)  Ethambutol 
B)  Isoniazid 
C)  Rifampicin 
D)  Ciprofloxacin 
A)  Ethambutol 
B)  Isoniazid 
C)  Rifampicin 
D)  Ciprofloxacin

Question 11

What type of media is recommended for the recovery of Mycobacterium haemophilum?

Accepted Answer

A)  Sheep blood agar (SB
A)  
B)  Chocolate 
C)  Polysaccharide egg antigen (PE
A)  
D)  Lowenstein-Jensen (LJ) 
A)  Sheep blood agar (SB
A)  
B)  Chocolate 
C)  Polysaccharide egg antigen (PE
A)  
D)  Lowenstein-Jensen (LJ)

Question 12

A child visits his doctor because he has had a fever and a nonproductive cough.The child is also short of breath.The doctor orders a routine sputum culture and an acid-fast bacillus (AFB)culture and smear.The smears shows red organisms arranged in ropes.What is the most probable cause of this child's fever and cough?

Accepted Answer

A)  Mycobacterium leprae 
B)  M. avium 
C)  M. intracellulare 
D)  M. tuberculosis 
A)  Mycobacterium leprae 
B)  M. avium 
C)  M. intracellulare 
D)  M. tuberculosis

Question 13

What media are recommended for routine culturing of specimens for the recovery of acid-fast bacilli?

Accepted Answer

A)  Lowenstein-Jensen and mycobacterial growth indicator tube 
B)  Middlebrook 7H10 and cooked meat broth 
C)  Sabouraud dextrose and LIM broth 
D)  Thiosulfate-citrate-bile salts-sucrose (TCBS) and thioglycollate broth 
A)  Lowenstein-Jensen and mycobacterial growth indicator tube 
B)  Middlebrook 7H10 and cooked meat broth 
C)  Sabouraud dextrose and LIM broth 
D)  Thiosulfate-citrate-bile salts-sucrose (TCBS) and thioglycollate broth

Exam 26: Mycobacterium Tuberculosis and Other Nontuberculosis Mycobacteria

If a person has had tuberculosis during his or her lifetime,how likely is it that the person will get the disease again?

Decontaminating agents used in the decontamination-digestion process include all of the following EXCEPT:

Middlebrook 7H10 and 7H11 media are enriched with all of the following EXCEPT:

What Mycobacterium species fails to grow in vitro?

What component of mycobacteria is used for identification in the nucleic acid hybridization assays?

How long does it take to detect Mycobacterium spp.with the BACTEC method?

What is the purpose of the digestion-decontamination processing of specimens submitted for mycobacterial culture?

What is the optimum growth time for most mycobacteria associated with disease?

The Centers for Disease Control and Prevention (CDC)recommends all the following drugs for the treatment of Mycobacterium tuberculosis EXCEPT:

What type of media is recommended for the recovery of Mycobacterium haemophilum?

What media are recommended for routine culturing of specimens for the recovery of acid-fast bacilli?

Bacterial Cell Structure, physiology, Metabolism, and Genetics

Host-Parasite Interaction

Laboratory Role in Infection Control

Control of Microorganisms

Performance Improvement in the Microbiology Laboratory

Specimen Collection and Processing

Microscopic Examination of Infected Materials

Use of Colonial Morphology for the Presumptive Identification of Microorganisms

Biochemical Identification of Gram-Negative Bacteria

Immunodiagnosis of Infectious Diseases

Applications of Molecular Diagnostics

Antibiotic Mechanisms of Action and Resistance

Antimicrobial Susceptibility Testing

Staphylococci

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

Aerobic Gram-Positive Bacilli

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

Spirochetes

Chlamydia and Rickettsia

Mycoplasma and Ureaplasma

Medically Significant Fungi

Diagnostic Parasitology

Clinical Virology

Agents of Bioterror

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

Ocular Infections

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