2026/2027
CIC Certified in Infection Control
Exam Review 2026/2027:
Comprehensive Study Guide for
Certification Success
Question 1
An immunocompromised patient inhales fungal spores. The organism adheres to
respiratory tissue, multiplies, avoids immune defenses, and causes pneumonia. Which
concept best describes this complete sequence?
A. Microbial colonization
B. Infectious disease process
C. Passive surveillance
D. Environmental contamination
Correct Answer: B. Infectious disease process
Rationale: An infectious disease process describes how a pathogen enters a
susceptible host, survives, multiplies, evades host defenses, damages tissue, and may
spread to others. Colonization does not produce tissue invasion or disease. Passive
surveillance is a method of collecting data, while environmental contamination refers
to microorganisms being present on surfaces or equipment rather than causing disease
in a host.
Question 2
A preoperative patient has methicillin-resistant Staphylococcus aureus detected
during routine nasal screening. The patient has no fever, drainage, inflammation, or
other symptoms. How should this finding be interpreted?
A. Invasive MRSA infection
B. Laboratory-confirmed bacteremia
C. MRSA colonization
D. Pseudo-infection requiring treatment
Correct Answer: C. MRSA colonization
Rationale: Colonization is the presence and growth of microorganisms without tissue
invasion, host response, or clinical disease. A positive nasal screening result alone
does not establish infection. Bacteremia requires organisms in the bloodstream, and
pseudo-infection usually results from contamination or testing errors. Although
,2026/2027
colonized patients may transmit MRSA, antimicrobial treatment is not automatically
indicated solely because screening is positive.
Question 3
Several patients have positive respiratory cultures for the same organism, but none
have compatible symptoms. Investigation reveals that the specimens were
contaminated by a laboratory water source. Which term best describes these findings?
A. Endemic infection
B. Pseudo-infection
C. Opportunistic infection
D. Community-acquired infection
Correct Answer: B. Pseudo-infection
Rationale: Pseudo-infection is the apparent occurrence of infection caused by
specimen contamination, environmental sources, or laboratory error rather than true
disease in patients. Endemic infection represents expected disease occurrence within a
population. Opportunistic infection occurs when impaired host defenses permit
disease, while community-acquired infection develops outside healthcare and is
present or incubating at admission.
Question 4
A single blood culture bottle grows coagulase-negative staphylococci in an afebrile
patient who has no vascular device or clinical evidence of infection. What is the
infection preventionist’s best interpretation?
A. The patient has definite bloodstream infection
B. The result most likely represents contamination
C. The organism indicates airborne transmission
D. Immediate broad-spectrum therapy is always required
Correct Answer: B. The result most likely represents contamination
Rationale: Skin organisms recovered from only one blood culture bottle in an
asymptomatic patient frequently represent contamination introduced during collection.
A bloodstream infection diagnosis requires clinical correlation, appropriate culture
patterns, and consideration of patient risk factors. Airborne transmission is unrelated
to this result. Immediate antimicrobial therapy is not automatically required because
unnecessary treatment can cause adverse effects and promote resistance.
Question 5
A patient without an active infection receives cefazolin shortly before a surgical
incision. What is the primary purpose of this antimicrobial administration?
,2026/2027
A. To treat a confirmed surgical infection
B. To provide prolonged empiric coverage
C. To prevent a procedure-associated infection
D. To eradicate asymptomatic colonization
Correct Answer: C. To prevent a procedure-associated infection
Rationale: Administration of an antimicrobial before a procedure to reduce the
likelihood of infection is prophylactic therapy. Therapeutic treatment is directed
toward a confirmed infection, whereas empiric therapy treats a suspected infection
before the organism is identified. Surgical prophylaxis is generally timed to provide
adequate tissue concentrations during the procedure and should not be continued
unnecessarily after the recommended period.
Question 6
A patient presents with fever, neck stiffness, altered consciousness, and suspected
bacterial meningitis. Antibiotics are started before the causative organism has been
identified. Which antimicrobial approach is being used?
A. Prophylactic therapy
B. Empiric therapy
C. Suppressive therapy
D. Targeted therapeutic therapy
Correct Answer: B. Empiric therapy
Rationale: Empiric therapy is initiated before laboratory identification of the pathogen
and is based on the clinical presentation, likely organisms, local resistance patterns,
and illness severity. Prophylaxis is used to prevent infection rather than treat
suspected disease. Targeted therapy begins after culture and susceptibility data
identify the organism. Delaying therapy in suspected bacterial meningitis could result
in serious harm.
Question 7
Blood cultures identify methicillin-susceptible Staphylococcus aureus in a patient
receiving broad-spectrum vancomycin and meropenem. Which action best reflects
antimicrobial stewardship?
A. Continue both drugs until discharge
B. Add a third antimicrobial for broader coverage
C. Narrow therapy to an effective targeted agent
D. Discontinue all therapy because the pathogen is known
Correct Answer: C. Narrow therapy to an effective targeted agent
, 2026/2027
Rationale: Once culture and susceptibility results identify a pathogen, broad empiric
therapy should usually be narrowed to the most appropriate targeted antimicrobial.
This process is known as de-escalation. Continuing unnecessary broad-spectrum
therapy increases resistance, toxicity, cost, and secondary infection risk. Adding
another drug is not justified, while stopping all therapy would leave a confirmed
bloodstream infection untreated.
Question 8
The infection preventionist is asked to help revise empiric treatment recommendations
for gram-negative bloodstream infections. Which facility report provides the most
useful information?
A. Employee vaccination report
B. Facility antibiogram
C. Environmental cleaning checklist
D. Patient satisfaction dashboard
Correct Answer: B. Facility antibiogram
Rationale: An antibiogram summarizes cumulative antimicrobial susceptibility
patterns among bacterial isolates collected in a facility over a defined period. It can
guide empiric therapy, reveal resistance trends, and support stewardship decisions.
Vaccination reports assess workforce protection, environmental checklists evaluate
cleaning performance, and patient satisfaction dashboards do not provide organism-
specific antimicrobial susceptibility information.
Question 9
Monthly microbiology reports show a sudden increase in carbapenem-resistant
Enterobacterales across two intensive care units. What should the infection
preventionist do first?
A. Assume the change is random and wait several months
B. Investigate potential transmission and confirm the data
C. Stop collecting cultures to avoid false-positive results
D. Begin treating every colonized patient with antibiotics
Correct Answer: B. Investigate potential transmission and confirm the data
Rationale: An unexpected increase in a multidrug-resistant organism may indicate
transmission, an outbreak, a testing change, or a surveillance artifact. The infection
preventionist should validate laboratory findings, review affected patients, assess
epidemiologic links, and examine prevention practices. Waiting may allow
transmission to continue. Stopping cultures impairs detection, while treating all
colonized patients is generally inappropriate and can worsen resistance.
CIC Certified in Infection Control
Exam Review 2026/2027:
Comprehensive Study Guide for
Certification Success
Question 1
An immunocompromised patient inhales fungal spores. The organism adheres to
respiratory tissue, multiplies, avoids immune defenses, and causes pneumonia. Which
concept best describes this complete sequence?
A. Microbial colonization
B. Infectious disease process
C. Passive surveillance
D. Environmental contamination
Correct Answer: B. Infectious disease process
Rationale: An infectious disease process describes how a pathogen enters a
susceptible host, survives, multiplies, evades host defenses, damages tissue, and may
spread to others. Colonization does not produce tissue invasion or disease. Passive
surveillance is a method of collecting data, while environmental contamination refers
to microorganisms being present on surfaces or equipment rather than causing disease
in a host.
Question 2
A preoperative patient has methicillin-resistant Staphylococcus aureus detected
during routine nasal screening. The patient has no fever, drainage, inflammation, or
other symptoms. How should this finding be interpreted?
A. Invasive MRSA infection
B. Laboratory-confirmed bacteremia
C. MRSA colonization
D. Pseudo-infection requiring treatment
Correct Answer: C. MRSA colonization
Rationale: Colonization is the presence and growth of microorganisms without tissue
invasion, host response, or clinical disease. A positive nasal screening result alone
does not establish infection. Bacteremia requires organisms in the bloodstream, and
pseudo-infection usually results from contamination or testing errors. Although
,2026/2027
colonized patients may transmit MRSA, antimicrobial treatment is not automatically
indicated solely because screening is positive.
Question 3
Several patients have positive respiratory cultures for the same organism, but none
have compatible symptoms. Investigation reveals that the specimens were
contaminated by a laboratory water source. Which term best describes these findings?
A. Endemic infection
B. Pseudo-infection
C. Opportunistic infection
D. Community-acquired infection
Correct Answer: B. Pseudo-infection
Rationale: Pseudo-infection is the apparent occurrence of infection caused by
specimen contamination, environmental sources, or laboratory error rather than true
disease in patients. Endemic infection represents expected disease occurrence within a
population. Opportunistic infection occurs when impaired host defenses permit
disease, while community-acquired infection develops outside healthcare and is
present or incubating at admission.
Question 4
A single blood culture bottle grows coagulase-negative staphylococci in an afebrile
patient who has no vascular device or clinical evidence of infection. What is the
infection preventionist’s best interpretation?
A. The patient has definite bloodstream infection
B. The result most likely represents contamination
C. The organism indicates airborne transmission
D. Immediate broad-spectrum therapy is always required
Correct Answer: B. The result most likely represents contamination
Rationale: Skin organisms recovered from only one blood culture bottle in an
asymptomatic patient frequently represent contamination introduced during collection.
A bloodstream infection diagnosis requires clinical correlation, appropriate culture
patterns, and consideration of patient risk factors. Airborne transmission is unrelated
to this result. Immediate antimicrobial therapy is not automatically required because
unnecessary treatment can cause adverse effects and promote resistance.
Question 5
A patient without an active infection receives cefazolin shortly before a surgical
incision. What is the primary purpose of this antimicrobial administration?
,2026/2027
A. To treat a confirmed surgical infection
B. To provide prolonged empiric coverage
C. To prevent a procedure-associated infection
D. To eradicate asymptomatic colonization
Correct Answer: C. To prevent a procedure-associated infection
Rationale: Administration of an antimicrobial before a procedure to reduce the
likelihood of infection is prophylactic therapy. Therapeutic treatment is directed
toward a confirmed infection, whereas empiric therapy treats a suspected infection
before the organism is identified. Surgical prophylaxis is generally timed to provide
adequate tissue concentrations during the procedure and should not be continued
unnecessarily after the recommended period.
Question 6
A patient presents with fever, neck stiffness, altered consciousness, and suspected
bacterial meningitis. Antibiotics are started before the causative organism has been
identified. Which antimicrobial approach is being used?
A. Prophylactic therapy
B. Empiric therapy
C. Suppressive therapy
D. Targeted therapeutic therapy
Correct Answer: B. Empiric therapy
Rationale: Empiric therapy is initiated before laboratory identification of the pathogen
and is based on the clinical presentation, likely organisms, local resistance patterns,
and illness severity. Prophylaxis is used to prevent infection rather than treat
suspected disease. Targeted therapy begins after culture and susceptibility data
identify the organism. Delaying therapy in suspected bacterial meningitis could result
in serious harm.
Question 7
Blood cultures identify methicillin-susceptible Staphylococcus aureus in a patient
receiving broad-spectrum vancomycin and meropenem. Which action best reflects
antimicrobial stewardship?
A. Continue both drugs until discharge
B. Add a third antimicrobial for broader coverage
C. Narrow therapy to an effective targeted agent
D. Discontinue all therapy because the pathogen is known
Correct Answer: C. Narrow therapy to an effective targeted agent
, 2026/2027
Rationale: Once culture and susceptibility results identify a pathogen, broad empiric
therapy should usually be narrowed to the most appropriate targeted antimicrobial.
This process is known as de-escalation. Continuing unnecessary broad-spectrum
therapy increases resistance, toxicity, cost, and secondary infection risk. Adding
another drug is not justified, while stopping all therapy would leave a confirmed
bloodstream infection untreated.
Question 8
The infection preventionist is asked to help revise empiric treatment recommendations
for gram-negative bloodstream infections. Which facility report provides the most
useful information?
A. Employee vaccination report
B. Facility antibiogram
C. Environmental cleaning checklist
D. Patient satisfaction dashboard
Correct Answer: B. Facility antibiogram
Rationale: An antibiogram summarizes cumulative antimicrobial susceptibility
patterns among bacterial isolates collected in a facility over a defined period. It can
guide empiric therapy, reveal resistance trends, and support stewardship decisions.
Vaccination reports assess workforce protection, environmental checklists evaluate
cleaning performance, and patient satisfaction dashboards do not provide organism-
specific antimicrobial susceptibility information.
Question 9
Monthly microbiology reports show a sudden increase in carbapenem-resistant
Enterobacterales across two intensive care units. What should the infection
preventionist do first?
A. Assume the change is random and wait several months
B. Investigate potential transmission and confirm the data
C. Stop collecting cultures to avoid false-positive results
D. Begin treating every colonized patient with antibiotics
Correct Answer: B. Investigate potential transmission and confirm the data
Rationale: An unexpected increase in a multidrug-resistant organism may indicate
transmission, an outbreak, a testing change, or a surveillance artifact. The infection
preventionist should validate laboratory findings, review affected patients, assess
epidemiologic links, and examine prevention practices. Waiting may allow
transmission to continue. Stopping cultures impairs detection, while treating all
colonized patients is generally inappropriate and can worsen resistance.
