Barkley Infectious Disease PRACTICE
QUESTIONS |ORIGINAL QUESTIONS &
ANSWERS |DETAILED RATIONALES
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1.
A 24-year-old patient presents with fever, malaise, and a productive
cough. Which finding most strongly supports a bacterial rather than
viral respiratory infection?
A. Rhinorrhea
B. Myalgias
C. Focal lobar consolidation
D. Nonproductive cough
Answer: C. Focal lobar consolidation
Focal consolidation on examination or imaging is more suggestive of
bacterial pneumonia, although clinical findings alone do not always
distinguish bacterial from viral infection.
2.
Which component of the immune system provides the most
immediate, nonspecific defense against invading pathogens?
A. Adaptive immunity
B. Innate immunity
,C. Immunologic memory
D. Antibody-mediated immunity
Answer: B. Innate immunity
Innate immunity includes physical barriers, complement, phagocytes,
and inflammatory responses that act rapidly without requiring prior
exposure.
3.
Which organism is classified as a gram-positive coccus?
A. Escherichia coli
B. Pseudomonas aeruginosa
C. Staphylococcus aureus
D. Neisseria gonorrhoeae
Answer: C. Staphylococcus aureus
Staphylococcus aureus is a gram-positive coccus that commonly
appears in clusters.
4.
A patient develops watery diarrhea several days after completing
clindamycin. Which pathogen is most likely responsible?
A. Giardia lamblia
B. Clostridioides difficile
C. Salmonella enterica
D. Campylobacter jejuni
Answer: B. Clostridioides difficile
Recent antibiotic exposure, particularly clindamycin, is strongly
associated with C. difficile infection.
,5.
Which laboratory test is most useful for confirming active
tuberculosis?
A. Tuberculin skin test alone
B. Interferon-gamma release assay alone
C. Sputum nucleic acid amplification testing
D. Chest radiograph alone
Answer: C. Sputum nucleic acid amplification testing
Nucleic acid amplification testing can rapidly detect M. tuberculosis
complex in respiratory specimens and may provide information about
rifampin resistance.
6.
Which transmission-based precaution is required for a patient with
suspected pulmonary tuberculosis?
A. Contact
B. Droplet
C. Airborne
D. Protective isolation
Answer: C. Airborne
Suspected or confirmed infectious pulmonary tuberculosis requires
airborne precautions, including an appropriate respirator and
airborne infection isolation room.
7.
Which pathogen is an obligate intracellular bacterium?
, A. Chlamydia trachomatis
B. Staphylococcus aureus
C. Streptococcus pyogenes
D. Escherichia coli
Answer: A. Chlamydia trachomatis
Chlamydia trachomatis requires host cells for replication.
8.
Which organism is most commonly associated with uncomplicated
urinary tract infection in a young woman?
A. Escherichia coli
B. Pseudomonas aeruginosa
C. Enterococcus faecium
D. Candida albicans
Answer: A. Escherichia coli
E. coli is the most common cause of uncomplicated cystitis.
9.
A patient has a rapidly expanding erythematous lesion with severe
pain out of proportion to examination findings. Which diagnosis
should be considered urgently?
A. Impetigo
B. Necrotizing fasciitis
C. Tinea corporis
D. Erysipelas
Answer: B. Necrotizing fasciitis
QUESTIONS |ORIGINAL QUESTIONS &
ANSWERS |DETAILED RATIONALES
|HINTED COMPLETE EXAM PREP
GRADED A+*INSTANT DOWNLOAD PDF
1.
A 24-year-old patient presents with fever, malaise, and a productive
cough. Which finding most strongly supports a bacterial rather than
viral respiratory infection?
A. Rhinorrhea
B. Myalgias
C. Focal lobar consolidation
D. Nonproductive cough
Answer: C. Focal lobar consolidation
Focal consolidation on examination or imaging is more suggestive of
bacterial pneumonia, although clinical findings alone do not always
distinguish bacterial from viral infection.
2.
Which component of the immune system provides the most
immediate, nonspecific defense against invading pathogens?
A. Adaptive immunity
B. Innate immunity
,C. Immunologic memory
D. Antibody-mediated immunity
Answer: B. Innate immunity
Innate immunity includes physical barriers, complement, phagocytes,
and inflammatory responses that act rapidly without requiring prior
exposure.
3.
Which organism is classified as a gram-positive coccus?
A. Escherichia coli
B. Pseudomonas aeruginosa
C. Staphylococcus aureus
D. Neisseria gonorrhoeae
Answer: C. Staphylococcus aureus
Staphylococcus aureus is a gram-positive coccus that commonly
appears in clusters.
4.
A patient develops watery diarrhea several days after completing
clindamycin. Which pathogen is most likely responsible?
A. Giardia lamblia
B. Clostridioides difficile
C. Salmonella enterica
D. Campylobacter jejuni
Answer: B. Clostridioides difficile
Recent antibiotic exposure, particularly clindamycin, is strongly
associated with C. difficile infection.
,5.
Which laboratory test is most useful for confirming active
tuberculosis?
A. Tuberculin skin test alone
B. Interferon-gamma release assay alone
C. Sputum nucleic acid amplification testing
D. Chest radiograph alone
Answer: C. Sputum nucleic acid amplification testing
Nucleic acid amplification testing can rapidly detect M. tuberculosis
complex in respiratory specimens and may provide information about
rifampin resistance.
6.
Which transmission-based precaution is required for a patient with
suspected pulmonary tuberculosis?
A. Contact
B. Droplet
C. Airborne
D. Protective isolation
Answer: C. Airborne
Suspected or confirmed infectious pulmonary tuberculosis requires
airborne precautions, including an appropriate respirator and
airborne infection isolation room.
7.
Which pathogen is an obligate intracellular bacterium?
, A. Chlamydia trachomatis
B. Staphylococcus aureus
C. Streptococcus pyogenes
D. Escherichia coli
Answer: A. Chlamydia trachomatis
Chlamydia trachomatis requires host cells for replication.
8.
Which organism is most commonly associated with uncomplicated
urinary tract infection in a young woman?
A. Escherichia coli
B. Pseudomonas aeruginosa
C. Enterococcus faecium
D. Candida albicans
Answer: A. Escherichia coli
E. coli is the most common cause of uncomplicated cystitis.
9.
A patient has a rapidly expanding erythematous lesion with severe
pain out of proportion to examination findings. Which diagnosis
should be considered urgently?
A. Impetigo
B. Necrotizing fasciitis
C. Tinea corporis
D. Erysipelas
Answer: B. Necrotizing fasciitis
