CNA Chapter 5 Exam: Safety, Infection
Control, and Emergency Procedures – Actual
Questions with Revised Answers (2026/2027
Edition) | 100% Pass Guarantee
Section 1: Infection Control Principles & Chain of Infection (12 Questions)
Key Concepts for This Section:
● Chain of infection: Infectious Agent → Reservoir → Portal of Exit → Mode of
Transmission → Portal of Entry → Susceptible Host
● Breaking any link in the chain prevents infection spread
● Most important infection control measure = HAND HYGIENE
● Standard Precautions: apply to ALL patients, ALL body fluids
Q1: Recall Question
List the six components of the chain of infection in correct order.
Correct Answer:
1. Infectious Agent
2. Reservoir
3. Portal of Exit
4. Mode of Transmission
5. Portal of Entry
6. Susceptible Host [CORRECT]
Rationale:
, ● Infectious Agent: Pathogen (bacteria, virus, fungus)
● Reservoir: Where pathogen lives/grows (humans, animals, equipment)
● Portal of Exit: How pathogen leaves reservoir (respiratory tract, blood, stool)
● Mode of Transmission: How pathogen travels (contact, droplet, airborne)
● Portal of Entry: How pathogen enters new host (mucus membranes, broken skin)
● Susceptible Host: Person who can get infected
Key takeaway: Break any link → infection stops.
Guarantee Pass Tip: "I R E M P S" – Infectious agent, Reservoir, Exit, Mode, Portal,
Susceptible.
Q2: Application Question
Breaking the chain of infection at the "mode of transmission" link would include which
nursing assistant action?
A. Washing hands before patient contact
B. Wearing appropriate PPE when in contact with body fluids
C. Keeping immunizations up to date
D. Covering the mouth when coughing
Correct Answer: B. Wearing appropriate PPE when in contact with body fluids
[CORRECT]
Rationale:
Correct: B is correct. PPE interrupts the mode of transmission by creating a barrier
between the pathogen and the new host.
A is incorrect: Hand hygiene breaks the chain at multiple points, but specifically targets
removing pathogens after contact.
,C is incorrect: Immunizations protect the susceptible host.
D is incorrect: Covering mouth breaks the portal of exit (prevents droplet spread).
Key takeaway: PPE blocks transmission; hand hygiene removes pathogens after
contact.
Guarantee Pass Tip: Match action to link: PPE = barrier = mode of transmission;
immunizations = susceptible host.
Q3: Recall Question
What is the single most important infection control measure for healthcare workers?
A. Wearing gloves for all patient contact
B. Hand hygiene
C. Wearing a mask
D. Isolation precautions
Correct Answer: B. Hand hygiene [CORRECT]
Rationale:
Correct: B is correct. Hand hygiene (handwashing or alcohol-based hand rub) is the #1
way to prevent transmission of infections.
A is incorrect: Gloves are important but must be combined with hand hygiene before
and after use.
C is incorrect: Masks protect against droplet/airborne but are not the primary method.
, D is incorrect: Isolation is for known infections; hand hygiene protects everyone.
Key takeaway: Hand hygiene is ALWAYS the first and most important step.
Guarantee Pass Tip: "Hands first, hands last" – before and after every patient contact.
Q4: Recall Question
Standard Precautions apply to:
A. Only patients with known infections
B. All patients, regardless of diagnosis
C. Only patients on isolation precautions
D. Only patients with bloodborne diseases
Correct Answer: B. All patients, regardless of diagnosis [CORRECT]
Rationale:
Correct: B is correct. Standard Precautions are used for EVERY patient because many
infections are not immediately apparent.
A is incorrect: That's Transmission-Based Precautions.
C is incorrect: Isolation patients get Standard + Transmission-Based.
D is incorrect: Standard Precautions cover ALL body fluids, not just bloodborne.
Key takeaway: Standard = universal – treat everyone as potentially infectious.
Guarantee Pass Tip: "Standard for ALL" – assume everyone's blood/body fluids are
infectious.
Control, and Emergency Procedures – Actual
Questions with Revised Answers (2026/2027
Edition) | 100% Pass Guarantee
Section 1: Infection Control Principles & Chain of Infection (12 Questions)
Key Concepts for This Section:
● Chain of infection: Infectious Agent → Reservoir → Portal of Exit → Mode of
Transmission → Portal of Entry → Susceptible Host
● Breaking any link in the chain prevents infection spread
● Most important infection control measure = HAND HYGIENE
● Standard Precautions: apply to ALL patients, ALL body fluids
Q1: Recall Question
List the six components of the chain of infection in correct order.
Correct Answer:
1. Infectious Agent
2. Reservoir
3. Portal of Exit
4. Mode of Transmission
5. Portal of Entry
6. Susceptible Host [CORRECT]
Rationale:
, ● Infectious Agent: Pathogen (bacteria, virus, fungus)
● Reservoir: Where pathogen lives/grows (humans, animals, equipment)
● Portal of Exit: How pathogen leaves reservoir (respiratory tract, blood, stool)
● Mode of Transmission: How pathogen travels (contact, droplet, airborne)
● Portal of Entry: How pathogen enters new host (mucus membranes, broken skin)
● Susceptible Host: Person who can get infected
Key takeaway: Break any link → infection stops.
Guarantee Pass Tip: "I R E M P S" – Infectious agent, Reservoir, Exit, Mode, Portal,
Susceptible.
Q2: Application Question
Breaking the chain of infection at the "mode of transmission" link would include which
nursing assistant action?
A. Washing hands before patient contact
B. Wearing appropriate PPE when in contact with body fluids
C. Keeping immunizations up to date
D. Covering the mouth when coughing
Correct Answer: B. Wearing appropriate PPE when in contact with body fluids
[CORRECT]
Rationale:
Correct: B is correct. PPE interrupts the mode of transmission by creating a barrier
between the pathogen and the new host.
A is incorrect: Hand hygiene breaks the chain at multiple points, but specifically targets
removing pathogens after contact.
,C is incorrect: Immunizations protect the susceptible host.
D is incorrect: Covering mouth breaks the portal of exit (prevents droplet spread).
Key takeaway: PPE blocks transmission; hand hygiene removes pathogens after
contact.
Guarantee Pass Tip: Match action to link: PPE = barrier = mode of transmission;
immunizations = susceptible host.
Q3: Recall Question
What is the single most important infection control measure for healthcare workers?
A. Wearing gloves for all patient contact
B. Hand hygiene
C. Wearing a mask
D. Isolation precautions
Correct Answer: B. Hand hygiene [CORRECT]
Rationale:
Correct: B is correct. Hand hygiene (handwashing or alcohol-based hand rub) is the #1
way to prevent transmission of infections.
A is incorrect: Gloves are important but must be combined with hand hygiene before
and after use.
C is incorrect: Masks protect against droplet/airborne but are not the primary method.
, D is incorrect: Isolation is for known infections; hand hygiene protects everyone.
Key takeaway: Hand hygiene is ALWAYS the first and most important step.
Guarantee Pass Tip: "Hands first, hands last" – before and after every patient contact.
Q4: Recall Question
Standard Precautions apply to:
A. Only patients with known infections
B. All patients, regardless of diagnosis
C. Only patients on isolation precautions
D. Only patients with bloodborne diseases
Correct Answer: B. All patients, regardless of diagnosis [CORRECT]
Rationale:
Correct: B is correct. Standard Precautions are used for EVERY patient because many
infections are not immediately apparent.
A is incorrect: That's Transmission-Based Precautions.
C is incorrect: Isolation patients get Standard + Transmission-Based.
D is incorrect: Standard Precautions cover ALL body fluids, not just bloodborne.
Key takeaway: Standard = universal – treat everyone as potentially infectious.
Guarantee Pass Tip: "Standard for ALL" – assume everyone's blood/body fluids are
infectious.
