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Certification in Infection Control (CIC) Examination | Latest
Verified Questions and Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the Certification in Infection
Control (CIC) examination. The questions are systematically organized across the eight core
domains defined by the Certification Board of Infection Control and Epidemiology (CBIC),
ranging from the identification of infectious disease processes and epidemiologic surveillance to
the practical application of transmission prevention, occupational health, and the technical
aspects of cleaning, disinfection, and sterilization. Each question is designed to test not only
recall but also the critical thinking and application skills required of infection preventionists. The
accompanying expert rationales offer concise, evidence-based explanations to reinforce key
concepts and clarify the clinical reasoning behind each correct answer.
Domain 1: Identification of Infectious Disease Processes (22
Items)
QUESTION 1
A patient presents with fever, dry cough, and infiltrates on chest imaging. A respiratory
specimen is positive for a pathogen that requires specific cell culture media containing
cysteine. Which organism is most likely?
A) Streptococcus pneumoniae
B) Haemophilus influenzae
C) Legionella pneumophila
D) Mycoplasma pneumoniae
CORRECT ANSWER: C
EXPERT RATIONALE: Legionella species require cysteine-supplemented media like
,2|Page
buffered charcoal yeast extract (BCYE) for growth, distinguishing them from other
respiratory pathogens.
QUESTION 2
A laboratory reports a Gram stain of cerebrospinal fluid showing gram-positive cocci in
chains. Which test is most critical for the initial identification and treatment guidance?
A) Oxidase test
B) Coagulase test
C) Catalase test
D) Optochin susceptibility
CORRECT ANSWER: C
EXPERT RATIONALE: The catalase test differentiates Streptococcus (catalase-negative)
from Staphylococcus (catalase-positive), guiding empiric therapy for meningitis.
QUESTION 3
A patient develops profuse watery diarrhea three days after completing a course of
clindamycin. What is the primary virulence factor of the most likely causative agent?
A) Shiga toxin
B) Enterotoxin A and cytotoxin B
C) Cholera toxin
D) Verotoxin
CORRECT ANSWER: B
EXPERT RATIONALE: Clostridioides difficile produces toxin A (enterotoxin) and toxin B
(cytotoxin), which cause colonic inflammation and diarrhea following antibiotic-induced
dysbiosis.
QUESTION 4
A healthcare worker sustains a needlestick injury from a source patient with hepatitis B
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surface antigen (HBsAg) positivity. What serologic status of the healthcare worker would
indicate immunity without prior infection?
A) Anti-HBs positive, anti-HBc negative
B) Anti-HBs positive, anti-HBc positive
C) Anti-HBs negative, anti-HBc positive
D) Anti-HBs negative, anti-HBc negative
CORRECT ANSWER: A
EXPERT RATIONALE: Isolated anti-HBs positivity indicates immunity from vaccination,
while the presence of anti-HBc suggests past or current infection.
QUESTION 5
A patient is diagnosed with pulmonary tuberculosis. The laboratory report notes "niacin
positive" and "nitrate reduction positive." Which Mycobacterium species is this?
A) Mycobacterium avium complex
B) Mycobacterium kansasii
C) Mycobacterium tuberculosis
D) Mycobacterium abscessus
CORRECT ANSWER: C
EXPERT RATIONALE: M. tuberculosis is characterized by positive niacin accumulation
and nitrate reduction tests, key biochemical markers used for species identification.
QUESTION 6
An outbreak of conjunctivitis occurs in a neonatal intensive care unit. Which pathogen is
most likely to cause a severe, purulent conjunctivitis with potential for systemic
complications in this population?
A) Chlamydia trachomatis
B) Neisseria gonorrhoeae
C) Adenovirus
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D) Staphylococcus aureus
CORRECT ANSWER: B
EXPERT RATIONALE: N. gonorrhoeae ophthalmia neonatorum is a severe, hyperacute
infection that can lead to corneal perforation and blindness, necessitating urgent
treatment.
QUESTION 7
A patient returning from Africa presents with fever, myalgia, and a petechial rash. A
blood smear shows intracellular, rod-shaped bacteria within endothelial cells. What is
the vector for this disease?
A) Tick
B) Mosquito
C) Louse
D) Flea
CORRECT ANSWER: C
EXPERT RATIONALE: The presentation is consistent with epidemic typhus caused
by Rickettsia prowazekii, which is transmitted by body lice (Pediculus humanus corporis).
QUESTION 8
A microbiology report identifies Cryptococcus neoformans from a patient’s cerebrospinal
fluid. Which virulence factor allows this organism to evade the immune system?
A) Polysaccharide capsule
B) Formation of pseudohyphae
C) Production of catalase
D) Spore formation
CORRECT ANSWER: A
EXPERT RATIONALE: The thick polysaccharide capsule of C. neoformans inhibits
phagocytosis and is a key virulence factor, particularly in immunocompromised hosts.
Certification in Infection Control (CIC) Examination | Latest
Verified Questions and Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the Certification in Infection
Control (CIC) examination. The questions are systematically organized across the eight core
domains defined by the Certification Board of Infection Control and Epidemiology (CBIC),
ranging from the identification of infectious disease processes and epidemiologic surveillance to
the practical application of transmission prevention, occupational health, and the technical
aspects of cleaning, disinfection, and sterilization. Each question is designed to test not only
recall but also the critical thinking and application skills required of infection preventionists. The
accompanying expert rationales offer concise, evidence-based explanations to reinforce key
concepts and clarify the clinical reasoning behind each correct answer.
Domain 1: Identification of Infectious Disease Processes (22
Items)
QUESTION 1
A patient presents with fever, dry cough, and infiltrates on chest imaging. A respiratory
specimen is positive for a pathogen that requires specific cell culture media containing
cysteine. Which organism is most likely?
A) Streptococcus pneumoniae
B) Haemophilus influenzae
C) Legionella pneumophila
D) Mycoplasma pneumoniae
CORRECT ANSWER: C
EXPERT RATIONALE: Legionella species require cysteine-supplemented media like
,2|Page
buffered charcoal yeast extract (BCYE) for growth, distinguishing them from other
respiratory pathogens.
QUESTION 2
A laboratory reports a Gram stain of cerebrospinal fluid showing gram-positive cocci in
chains. Which test is most critical for the initial identification and treatment guidance?
A) Oxidase test
B) Coagulase test
C) Catalase test
D) Optochin susceptibility
CORRECT ANSWER: C
EXPERT RATIONALE: The catalase test differentiates Streptococcus (catalase-negative)
from Staphylococcus (catalase-positive), guiding empiric therapy for meningitis.
QUESTION 3
A patient develops profuse watery diarrhea three days after completing a course of
clindamycin. What is the primary virulence factor of the most likely causative agent?
A) Shiga toxin
B) Enterotoxin A and cytotoxin B
C) Cholera toxin
D) Verotoxin
CORRECT ANSWER: B
EXPERT RATIONALE: Clostridioides difficile produces toxin A (enterotoxin) and toxin B
(cytotoxin), which cause colonic inflammation and diarrhea following antibiotic-induced
dysbiosis.
QUESTION 4
A healthcare worker sustains a needlestick injury from a source patient with hepatitis B
,3|Page
surface antigen (HBsAg) positivity. What serologic status of the healthcare worker would
indicate immunity without prior infection?
A) Anti-HBs positive, anti-HBc negative
B) Anti-HBs positive, anti-HBc positive
C) Anti-HBs negative, anti-HBc positive
D) Anti-HBs negative, anti-HBc negative
CORRECT ANSWER: A
EXPERT RATIONALE: Isolated anti-HBs positivity indicates immunity from vaccination,
while the presence of anti-HBc suggests past or current infection.
QUESTION 5
A patient is diagnosed with pulmonary tuberculosis. The laboratory report notes "niacin
positive" and "nitrate reduction positive." Which Mycobacterium species is this?
A) Mycobacterium avium complex
B) Mycobacterium kansasii
C) Mycobacterium tuberculosis
D) Mycobacterium abscessus
CORRECT ANSWER: C
EXPERT RATIONALE: M. tuberculosis is characterized by positive niacin accumulation
and nitrate reduction tests, key biochemical markers used for species identification.
QUESTION 6
An outbreak of conjunctivitis occurs in a neonatal intensive care unit. Which pathogen is
most likely to cause a severe, purulent conjunctivitis with potential for systemic
complications in this population?
A) Chlamydia trachomatis
B) Neisseria gonorrhoeae
C) Adenovirus
, 4|Page
D) Staphylococcus aureus
CORRECT ANSWER: B
EXPERT RATIONALE: N. gonorrhoeae ophthalmia neonatorum is a severe, hyperacute
infection that can lead to corneal perforation and blindness, necessitating urgent
treatment.
QUESTION 7
A patient returning from Africa presents with fever, myalgia, and a petechial rash. A
blood smear shows intracellular, rod-shaped bacteria within endothelial cells. What is
the vector for this disease?
A) Tick
B) Mosquito
C) Louse
D) Flea
CORRECT ANSWER: C
EXPERT RATIONALE: The presentation is consistent with epidemic typhus caused
by Rickettsia prowazekii, which is transmitted by body lice (Pediculus humanus corporis).
QUESTION 8
A microbiology report identifies Cryptococcus neoformans from a patient’s cerebrospinal
fluid. Which virulence factor allows this organism to evade the immune system?
A) Polysaccharide capsule
B) Formation of pseudohyphae
C) Production of catalase
D) Spore formation
CORRECT ANSWER: A
EXPERT RATIONALE: The thick polysaccharide capsule of C. neoformans inhibits
phagocytosis and is a key virulence factor, particularly in immunocompromised hosts.
