ATI Infection Control Comprehensive Nursing Review Guide
2026 | Complete Study Resource Covering Infection
Prevention, Standard and Transmission-Based Precautions,
Aseptic Technique, Sterile Procedures, Patient Safety, PPE
Guidelines, Clinical Applications, Practice Questions, and Exam
Preparation Strategies
SECTION 1: CHAIN OF INFECTION
Question 1
A nurse identifies that a client's surgical wound has become infected. Which link
in the chain of infection is represented by the wound drainage?
A. Reservoir
B. Portal of exit
C. Mode of transmission
D. Susceptible host
Answer: B. Portal of exit
Rationale: The portal of exit is the path by which the pathogen leaves the
reservoir. Wound drainage allows bacteria to exit the wound and potentially
spread to others.
Question 2
Which of the following is the most effective way to break the chain of infection at
the reservoir link?
A. Hand hygiene
B. Proper disposal of contaminated linens
C. Using personal protective equipment (PPE)
D. Administering antibiotics to the host
Answer: B. Proper disposal of contaminated linens
,Rationale: Reservoirs include equipment, linens, and body fluids. Proper disposal
reduces the reservoir. Hand hygiene breaks transmission, not the reservoir itself.
Question 3
A client has a urinary catheter and develops a catheter-associated urinary tract
infection (CAUTI). The catheter serves as which link in the chain of infection?
A. Portal of entry
B. Reservoir
C. Susceptible host
D. Vector
Answer: B. Reservoir
Rationale: The catheter itself becomes colonized with bacteria, acting as a
reservoir for pathogens to multiply and cause infection.
Question 4
A nurse is teaching a client about infection prevention. Which statement by the
client indicates an understanding of the chain of infection?
A. "I can get an infection if I have a weak immune system."
B. "Infections only come from other people who are sick."
C. "Washing my hands only protects me, not others."
D. "Antibiotics kill all types of infectious agents."
Answer: A. "I can get an infection if I have a weak immune system."
Rationale: A susceptible host is one of the six links in the chain of infection.
Clients with weakened immune systems are at increased risk for infection.
Question 5
A nurse is caring for a client who has an infection. The nurse understands that the
infectious agent must have a place to grow and multiply. This place is called the:
,A. Portal of entry
B. Reservoir
C. Mode of transmission
D. Susceptible host
Answer: B. Reservoir
Rationale: The reservoir is the environment where the infectious agent grows and
lives. It can be a person, animal, or contaminated surface.
Question 6
Which of the following is an example of a portal of entry?
A. Skin breakdown from a pressure injury
B. Contaminated food in the cafeteria
C. A healthcare worker's unwashed hands
D. A client's sneeze
Answer: A. Skin breakdown from a pressure injury
Rationale: The portal of entry is the path the pathogen takes to enter a
susceptible host. Broken skin, mucous membranes, and respiratory tracts are
common portals of entry.
Question 7
A nurse is reviewing the chain of infection with a newly licensed nurse. Which
statement by the newly licensed nurse indicates a need for further teaching?
A. "Breaking any link in the chain can prevent infection."
B. "The infectious agent is the pathogen that causes disease."
C. "The mode of transmission is how the pathogen spreads."
D. "The reservoir is the same as the susceptible host."
Answer: D. "The reservoir is the same as the susceptible host."
Rationale: The reservoir is where the pathogen lives and grows, while the
susceptible host is the person who can become infected. These are two distinct
links in the chain of infection.
, Question 8
A client develops pneumonia after being on a ventilator. The ventilator tubing
represents which link in the chain of infection?
A. Portal of exit
B. Reservoir
C. Mode of transmission
D. Portal of entry
Answer: B. Reservoir
Rationale: Medical equipment like ventilator tubing can become contaminated
and serve as a reservoir where pathogens multiply, leading to healthcare-
associated infections.
Question 9
A nurse is caring for a client who has an infection transmitted through direct
contact. Which of the following is an example of direct contact transmission?
A. Touching a client's wound without gloves
B. Inhaling airborne particles from a sneeze
C. Touching a contaminated bed rail
D. Receiving a blood transfusion
Answer: A. Touching a client's wound without gloves
Rationale: Direct contact transmission occurs when there is physical contact
between the infected person and a susceptible host, such as touching infected
skin or wounds.
Question 10
A nurse is educating a group of nursing students about the chain of infection. The
nurse should identify that which of the following is the first link in the chain?
A. Reservoir
B. Portal of exit
2026 | Complete Study Resource Covering Infection
Prevention, Standard and Transmission-Based Precautions,
Aseptic Technique, Sterile Procedures, Patient Safety, PPE
Guidelines, Clinical Applications, Practice Questions, and Exam
Preparation Strategies
SECTION 1: CHAIN OF INFECTION
Question 1
A nurse identifies that a client's surgical wound has become infected. Which link
in the chain of infection is represented by the wound drainage?
A. Reservoir
B. Portal of exit
C. Mode of transmission
D. Susceptible host
Answer: B. Portal of exit
Rationale: The portal of exit is the path by which the pathogen leaves the
reservoir. Wound drainage allows bacteria to exit the wound and potentially
spread to others.
Question 2
Which of the following is the most effective way to break the chain of infection at
the reservoir link?
A. Hand hygiene
B. Proper disposal of contaminated linens
C. Using personal protective equipment (PPE)
D. Administering antibiotics to the host
Answer: B. Proper disposal of contaminated linens
,Rationale: Reservoirs include equipment, linens, and body fluids. Proper disposal
reduces the reservoir. Hand hygiene breaks transmission, not the reservoir itself.
Question 3
A client has a urinary catheter and develops a catheter-associated urinary tract
infection (CAUTI). The catheter serves as which link in the chain of infection?
A. Portal of entry
B. Reservoir
C. Susceptible host
D. Vector
Answer: B. Reservoir
Rationale: The catheter itself becomes colonized with bacteria, acting as a
reservoir for pathogens to multiply and cause infection.
Question 4
A nurse is teaching a client about infection prevention. Which statement by the
client indicates an understanding of the chain of infection?
A. "I can get an infection if I have a weak immune system."
B. "Infections only come from other people who are sick."
C. "Washing my hands only protects me, not others."
D. "Antibiotics kill all types of infectious agents."
Answer: A. "I can get an infection if I have a weak immune system."
Rationale: A susceptible host is one of the six links in the chain of infection.
Clients with weakened immune systems are at increased risk for infection.
Question 5
A nurse is caring for a client who has an infection. The nurse understands that the
infectious agent must have a place to grow and multiply. This place is called the:
,A. Portal of entry
B. Reservoir
C. Mode of transmission
D. Susceptible host
Answer: B. Reservoir
Rationale: The reservoir is the environment where the infectious agent grows and
lives. It can be a person, animal, or contaminated surface.
Question 6
Which of the following is an example of a portal of entry?
A. Skin breakdown from a pressure injury
B. Contaminated food in the cafeteria
C. A healthcare worker's unwashed hands
D. A client's sneeze
Answer: A. Skin breakdown from a pressure injury
Rationale: The portal of entry is the path the pathogen takes to enter a
susceptible host. Broken skin, mucous membranes, and respiratory tracts are
common portals of entry.
Question 7
A nurse is reviewing the chain of infection with a newly licensed nurse. Which
statement by the newly licensed nurse indicates a need for further teaching?
A. "Breaking any link in the chain can prevent infection."
B. "The infectious agent is the pathogen that causes disease."
C. "The mode of transmission is how the pathogen spreads."
D. "The reservoir is the same as the susceptible host."
Answer: D. "The reservoir is the same as the susceptible host."
Rationale: The reservoir is where the pathogen lives and grows, while the
susceptible host is the person who can become infected. These are two distinct
links in the chain of infection.
, Question 8
A client develops pneumonia after being on a ventilator. The ventilator tubing
represents which link in the chain of infection?
A. Portal of exit
B. Reservoir
C. Mode of transmission
D. Portal of entry
Answer: B. Reservoir
Rationale: Medical equipment like ventilator tubing can become contaminated
and serve as a reservoir where pathogens multiply, leading to healthcare-
associated infections.
Question 9
A nurse is caring for a client who has an infection transmitted through direct
contact. Which of the following is an example of direct contact transmission?
A. Touching a client's wound without gloves
B. Inhaling airborne particles from a sneeze
C. Touching a contaminated bed rail
D. Receiving a blood transfusion
Answer: A. Touching a client's wound without gloves
Rationale: Direct contact transmission occurs when there is physical contact
between the infected person and a susceptible host, such as touching infected
skin or wounds.
Question 10
A nurse is educating a group of nursing students about the chain of infection. The
nurse should identify that which of the following is the first link in the chain?
A. Reservoir
B. Portal of exit
