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INFECTION CONTROL CERTIFICATION EXAM
(ELABORATIONS) – 125 PRACTICE QUESTIONS
WITH VERIFIED ANSWERS (2026)
Public Health / Nursing / Biology
Exam Coverage:
• Section A (Q1–Q25): Chain of infection, modes of
transmission, Standard Precautions, and transmission-
based precautions.
• Section B (Q26–Q50): Asepsis, sterilization, disinfection,
PPE, and bloodborne pathogens.
• Section C (Q51–Q75): Post-exposure management,
engineering controls, work practice controls, and
environmental cleaning.
• Section D (Q76–Q100): Infection control program
components, surveillance, outbreak investigation, and
epidemiological concepts.
• Section E (Q101–Q125): Advanced infection prevention
concepts, including antimicrobial stewardship, sepsis, and
herd immunity.
1. The first link in the chain of infection is:
A) The susceptible host
B) The infectious agent
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C) The mode of transmission
D) The portal of entry
CORRECT ANSWER: B) The infectious agent
RATIONALE: Option B is correct because the chain of infection
begins with the infectious agent (bacteria, virus, fungus,
parasite, or prion) that causes disease. Option A is incorrect
because the susceptible host is the final link in the chain.
Option C is incorrect because the mode of transmission is the
third link. Option D is incorrect because the portal of entry is the
fourth link.
2. Which of the following is the most common mode of
transmission for healthcare-associated infections?
A) Airborne
B) Contact
C) Droplet
D) Vector-borne
CORRECT ANSWER: B) Contact
RATIONALE: Option B is correct because contact transmission,
including direct and indirect contact, is the most common and
most preventable mode of transmission in healthcare settings.
Option A is incorrect because airborne transmission is less
common. Option C is incorrect because droplet transmission is
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less common than contact. Option D is incorrect because
vector-borne transmission is rare in healthcare settings.
3. Standard Precautions apply to:
A) Only patients with confirmed infections
B) Only patients with bloodborne pathogens
C) All patients regardless of suspected or confirmed infection
status
D) Only patients in isolation rooms
CORRECT ANSWER: C) All patients regardless of suspected
or confirmed infection status
RATIONALE: Option C is correct because Standard Precautions
are the minimum infection prevention practices that apply to all
patient care, regardless of suspected or confirmed infection
status. Option A is incorrect because Standard Precautions
apply to all patients. Option B is incorrect because Standard
Precautions are broader than bloodborne pathogens. Option D
is incorrect because Standard Precautions are not limited to
isolation rooms.
4. A patient with active pulmonary tuberculosis requires which
type of precautions?
A) Contact precautions
B) Droplet precautions
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C) Airborne precautions
D) Standard precautions only
CORRECT ANSWER: C) Airborne precautions
RATIONALE: Option C is correct because active pulmonary
tuberculosis requires airborne precautions, including an N95
respirator and a negative-pressure room (airborne infection
isolation room). Option A is incorrect because contact
precautions are for organisms spread by direct or indirect
contact. Option B is incorrect because droplet precautions are
for large respiratory droplets. Option D is incorrect because
Standard Precautions alone are insufficient for tuberculosis.
5. The minimum duration for washing hands with soap and
water is:
A) 5 seconds
B) 10 seconds
C) 20 seconds
D) 60 seconds
CORRECT ANSWER: C) 20 seconds
RATIONALE: Option C is correct because the CDC recommends
scrubbing hands with soap for at least 20 seconds to effectively
remove pathogens. Option A is incorrect because 5 seconds is
insufficient. Option B is incorrect because 10 seconds is
INFECTION CONTROL CERTIFICATION EXAM
(ELABORATIONS) – 125 PRACTICE QUESTIONS
WITH VERIFIED ANSWERS (2026)
Public Health / Nursing / Biology
Exam Coverage:
• Section A (Q1–Q25): Chain of infection, modes of
transmission, Standard Precautions, and transmission-
based precautions.
• Section B (Q26–Q50): Asepsis, sterilization, disinfection,
PPE, and bloodborne pathogens.
• Section C (Q51–Q75): Post-exposure management,
engineering controls, work practice controls, and
environmental cleaning.
• Section D (Q76–Q100): Infection control program
components, surveillance, outbreak investigation, and
epidemiological concepts.
• Section E (Q101–Q125): Advanced infection prevention
concepts, including antimicrobial stewardship, sepsis, and
herd immunity.
1. The first link in the chain of infection is:
A) The susceptible host
B) The infectious agent
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C) The mode of transmission
D) The portal of entry
CORRECT ANSWER: B) The infectious agent
RATIONALE: Option B is correct because the chain of infection
begins with the infectious agent (bacteria, virus, fungus,
parasite, or prion) that causes disease. Option A is incorrect
because the susceptible host is the final link in the chain.
Option C is incorrect because the mode of transmission is the
third link. Option D is incorrect because the portal of entry is the
fourth link.
2. Which of the following is the most common mode of
transmission for healthcare-associated infections?
A) Airborne
B) Contact
C) Droplet
D) Vector-borne
CORRECT ANSWER: B) Contact
RATIONALE: Option B is correct because contact transmission,
including direct and indirect contact, is the most common and
most preventable mode of transmission in healthcare settings.
Option A is incorrect because airborne transmission is less
common. Option C is incorrect because droplet transmission is
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less common than contact. Option D is incorrect because
vector-borne transmission is rare in healthcare settings.
3. Standard Precautions apply to:
A) Only patients with confirmed infections
B) Only patients with bloodborne pathogens
C) All patients regardless of suspected or confirmed infection
status
D) Only patients in isolation rooms
CORRECT ANSWER: C) All patients regardless of suspected
or confirmed infection status
RATIONALE: Option C is correct because Standard Precautions
are the minimum infection prevention practices that apply to all
patient care, regardless of suspected or confirmed infection
status. Option A is incorrect because Standard Precautions
apply to all patients. Option B is incorrect because Standard
Precautions are broader than bloodborne pathogens. Option D
is incorrect because Standard Precautions are not limited to
isolation rooms.
4. A patient with active pulmonary tuberculosis requires which
type of precautions?
A) Contact precautions
B) Droplet precautions
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C) Airborne precautions
D) Standard precautions only
CORRECT ANSWER: C) Airborne precautions
RATIONALE: Option C is correct because active pulmonary
tuberculosis requires airborne precautions, including an N95
respirator and a negative-pressure room (airborne infection
isolation room). Option A is incorrect because contact
precautions are for organisms spread by direct or indirect
contact. Option B is incorrect because droplet precautions are
for large respiratory droplets. Option D is incorrect because
Standard Precautions alone are insufficient for tuberculosis.
5. The minimum duration for washing hands with soap and
water is:
A) 5 seconds
B) 10 seconds
C) 20 seconds
D) 60 seconds
CORRECT ANSWER: C) 20 seconds
RATIONALE: Option C is correct because the CDC recommends
scrubbing hands with soap for at least 20 seconds to effectively
remove pathogens. Option A is incorrect because 5 seconds is
insufficient. Option B is incorrect because 10 seconds is
