Infection Control Nursing Flashcards

Question 1

What are the links in the chain of infection that healthcare workers aim to interrupt?

Accepted Answer

The chain of infection has six links: the infectious agent, its reservoir, the portal of exit, the mode of transmission, the portal of entry, and a susceptible host. Infection control strategies work by breaking one or more of these links, so that the agent cannot move from a source to a new person.

Question 2

What is the difference between colonization and infection in a patient?

Accepted Answer

Colonization means a microorganism is present and may be growing on or in a person without causing signs of disease. Infection means the organism is multiplying and causing harm, which usually produces clinical signs. Recognizing which state applies affects testing decisions, precautions, and how the case is recorded.

Question 3

Which mode of transmission involves large respiratory droplets traveling short distances?

Accepted Answer

Droplet transmission occurs when respiratory droplets, generated by coughing, sneezing, talking, or certain procedures, travel a short distance and land on the mucous membranes or conjunctiva of another person. Because these droplets do not stay suspended in air for long, the risk is greatest when people are in close face-to-face contact.

Question 4

How does airborne transmission differ from droplet transmission in terms of particle behavior?

Accepted Answer

Airborne transmission involves very small particles, sometimes called droplet nuclei, that can remain suspended in the air for extended periods and travel farther than droplets. Because these particles can be carried through ventilation systems and across a room, controls focus on airflow, room design, and respiratory protection rather than distance alone.

Question 5

What is a healthcare-associated infection, and why is it tracked separately?

Accepted Answer

A healthcare-associated infection is an infection acquired during care in a health facility that was not present or incubating when the person was admitted. Facilities track these infections separately because they reveal gaps in prevention practices, support benchmarking, and help staff focus improvement efforts on the procedures and settings where transmission is most likely.

Question 6

What does the term susceptible host mean in the context of infection prevention?

Accepted Answer

A susceptible host is a person who lacks adequate defenses against a particular organism, due to factors such as age, immune status, underlying conditions, or invasive devices. Prevention efforts try to reduce host vulnerability as well as limiting exposure, because a person who is less susceptible is less likely to develop infection after exposure.

Question 7

Why is a reservoir important when investigating the source of an infection?

Accepted Answer

A reservoir is the habitat where an infectious agent normally lives and multiplies, which may be a person, an animal, an environmental surface, or water. Identifying the reservoir tells investigators where the organism originates, which determines whether the control measure should target a colonized patient, a contaminated object, or a broader environmental source.

Question 8

What is the purpose of a portal of entry in the chain of infection?

Accepted Answer

A portal of entry is any route by which an organism enters a susceptible host, such as a break in the skin, a mucous membrane, the respiratory tract, or an invasive device inserted into the body. Because many transmission events involve devices and wounds, protecting these routes is a central part of prevention planning.

Question 9

When should healthcare workers perform hand hygiene during patient care?

Accepted Answer

Hand hygiene is indicated before patient contact, before clean or aseptic tasks, after body fluid exposure risk, after patient contact, and after contact with the patient's surroundings. These moments are commonly grouped as the five moments for hand hygiene, and they apply regardless of whether gloves are worn.

Question 10

When is alcohol-based hand rub preferred over soap and water?

Accepted Answer

Alcohol-based hand rub is generally preferred for routine decontamination when hands are not visibly soiled, because it acts quickly, is well tolerated, and is available at the point of care. Soap and water are required when hands are visibly dirty or soiled with blood or body fluids, and after exposure to spore-forming organisms.

Question 11

What is the correct sequence for putting on personal protective equipment?

Accepted Answer

A commonly taught sequence is hand hygiene, then gown, then mask or respirator, then eye protection, and finally gloves, with gloves covering the gown cuffs. Facility policy may vary in details, so staff should follow the protocol their organization has adopted and practice it until the steps are automatic.

Question 12

What is the general principle for removing contaminated personal protective equipment safely?

Accepted Answer

The general principle is to remove the most contaminated items first and handle the outside of gloves and gowns as little as possible, so that the wearer's skin and clothing stay clean. Gloves are usually removed first, then eye protection, the gown, and the mask or respirator, followed by hand hygiene.

Question 13

Why must gloves never be considered a substitute for hand hygiene?

Accepted Answer

Gloves supplement hand hygiene rather than replacing it. They reduce direct contact with organisms, but they can tear unnoticed and can carry contamination from one task to the next. Hands can also be contaminated during glove removal, so hand hygiene must be performed before donning gloves and again after removing them.

Question 14

How should a respirator differ from a surgical mask when protecting against airborne agents?

Accepted Answer

A respirator is designed to filter very small airborne particles and to form a close seal against the face, which requires a fit check each time it is donned. A surgical mask primarily provides a barrier against splashes and large droplets and does not provide the same filtration or seal.

Question 15

What does a fit test accomplish for a tight-fitting respirator?

Accepted Answer

A fit test confirms that a specific make, model, and size of tight-fitting respirator forms an adequate seal on an individual wearer's face. Because face shapes vary, a respirator that fits one person may leak for another, so fit testing is typically repeated when a person changes respirator models.

Question 16

When is a face shield or goggles used alongside other protective equipment?

Accepted Answer

Eye protection is used when procedures or care activities may generate splashes, sprays, or respiratory droplets that could reach the mucous membranes of the eyes, nose, or mouth. Goggles or a face shield are worn with a mask, and the choice depends on fit, visibility, and whether the eyewear can be cleaned and reused.

Question 17

What are standard precautions, and to whom do they apply?

Accepted Answer

Standard precautions are the baseline practices used for all patients regardless of their known or suspected infection status. They include hand hygiene, appropriate personal protective equipment, safe handling of sharps, respiratory hygiene and cough etiquette, and safe management of soiled linen, equipment, and waste.

Question 18

What is the main purpose of transmission-based precautions?

Accepted Answer

Transmission-based precautions are added to standard precautions for patients with known or suspected infections that spread by contact, droplet, or airborne routes. Their purpose is to interrupt the specific route of spread that applies to a given organism, so they are selected based on how the infection is transmitted rather than on the diagnosis name.

Question 19

What do contact precautions require when caring for a patient in a shared or private room?

Accepted Answer

Contact precautions require gloves and a gown for all entry into the patient's room or area, including when touching the patient, the environment, or items the patient has used. Room placement and equipment assignment are also considered, with dedicated equipment preferred when feasible. The same requirements apply in shared or private rooms.

Question 20

What does droplet precaution require for staff entering a patient room?

Accepted Answer

Droplet precautions call for a surgical mask whenever staff enter the room or are within close proximity to the patient, along with standard precautions. Patients are often placed in a private room or cohorted with others who have the same organism, and they wear a mask when transported outside the room.

Question 21

What are the key requirements of airborne precautions for a patient room?

Accepted Answer

Airborne precautions call for a room designed to maintain negative pressure relative to adjacent areas, with the door kept closed and air exhausted. Staff entering the room wear a fit-tested respirator, and the patient wears a mask during transport. The room is not used for other patients until air has cleared.

Question 22

When can transmission-based precautions be discontinued for a patient?

Accepted Answer

Discontinuation depends on the organism, the clinical course, and the criteria set by the facility and current public health guidance, not on a fixed calendar interval. Staff should follow written criteria for ending each type of precaution and document the decision to protect both patients and others.

Question 23

What is the role of isolation signage in a healthcare facility?

Accepted Answer

Isolation signage alerts staff, visitors, and support personnel to the type of precautions required before they enter a room or area. Clear signs state what protective equipment is needed and where supplies are located, which reduces errors, improves consistency, and helps prevent unplanned exposure among people who are not routinely involved in care.

Question 24

How does a nurse decide between standard and transmission-based precautions for a new admission?

Accepted Answer

Standard precautions apply to every patient at all times, so the decision concerns whether additional transmission-based precautions are needed. Nurses review the admission screening history, any known or suspected organisms, symptoms, and the facility's current guidance, then apply the additional precautions that match the likely route of spread until the picture is clearer.

Question 25

What is the difference between cleaning, disinfection, and sterilization?

Accepted Answer

Cleaning physically removes soil, debris, and many microorganisms from surfaces, usually with water and detergent. Disinfection uses chemical or physical agents to eliminate most pathogens on surfaces but not necessarily all spores. Sterilization destroys all microorganisms, including bacterial spores, and is required for items that enter sterile tissue or the vascular system.

Question 26

Why must cleaning happen before disinfection on a contaminated surface?

Accepted Answer

Organic matter such as blood, mucus, and dirt can shield microorganisms and reduce the effectiveness of disinfectants. Cleaning removes this soil first, so that the disinfectant can contact the surface directly and work as the product label and facility protocol intend. Skipping the cleaning step often leads to a false sense of safety.

Question 27

What does contact time mean for a surface disinfectant?

Accepted Answer

Contact time is the length of time a disinfectant must remain wet on a surface to achieve its labeled kill claim. Wiping the surface dry too early shortens this period and can leave organisms alive, so staff should follow the time stated on the product's instructions and keep the surface visibly wet for that duration.

Question 28

How are high-touch surfaces prioritized in a routine environmental cleaning plan?

Accepted Answer

High-touch surfaces are items that many people handle frequently, such as bed rails, call buttons, doorknobs, faucet handles, and commode surfaces. Cleaning plans give these surfaces priority, with frequency set by the level of use and the risk to patients, and they are checked during routine audits to confirm that the work was done.

Question 29

What is the purpose of a sharps container, and what should never be placed inside it?

Accepted Answer

A sharps container is a puncture-resistant, leak-resistant receptacle designed to hold needles, scalpel blades, and other sharp items. Sharps containers must never hold ordinary trash, and sharps should not be recapped or forced into the opening. The container is replaced when it reaches its fill line rather than being overfilled.

Question 30

How should contaminated linen be handled to reduce the spread of infection?

Accepted Answer

Contaminated linen should be bagged at the point of use, handled as little as possible, and kept away from the body while being carried. Staff should not sort or rinse linen in patient areas, and laundry should be transported in closed, labeled containers. Facility policy defines bag color and labeling conventions.

Question 31

What is the proper approach to handling waste that may contain infectious material?

Accepted Answer

Waste should be segregated at the point of generation into categories defined by facility policy, such as regular trash, regulated medical waste, and sharps. Containers must be labeled, lined, and closed before transport, and staff should wear appropriate gloves when handling bags. Improper mixing can expose workers and increase disposal costs unnecessarily.

Question 32

What is the difference between a single-use device and a reusable device in terms of reprocessing?

Accepted Answer

A single-use device is designed for one patient and one use, and is discarded after use. A reusable device must go through a validated process of cleaning, disinfection or sterilization, and inspection before it can be used again. Manufacturer instructions must be followed, because reprocessing steps that work for one item may damage another.

Question 33

What is a biological indicator used for in sterilization monitoring?

Accepted Answer

A biological indicator is a standardized test system containing resistant microorganisms, used to verify that a sterilization cycle achieved the expected lethality. It is processed alongside routine loads, and its results are documented as part of quality assurance. Chemical indicators give an immediate visual signal, but biological indicators provide a direct check on sterility.

Question 34

What is infection surveillance, and why do facilities conduct it?

Accepted Answer

Infection surveillance is the ongoing, systematic collection, analysis, and interpretation of data on infections in a defined population, used to guide action. Facilities conduct it to detect trends and clusters early, measure the effect of prevention efforts, and compare performance over time, with results shared with clinical teams and leaders.

Question 35

What is a device-associated infection rate, and why must the denominator be recorded?

Accepted Answer

A device-associated infection rate compares the number of infections linked to a device, such as a urinary catheter or central line, with the amount of device exposure during the same period. The denominator, often expressed as device-days, allows units of different sizes and occupancy levels to be compared fairly.

Question 36

What is an outbreak in a healthcare setting?

Accepted Answer

An outbreak is an excess of infections, above the expected baseline, among patients, staff, or visitors in a particular location or time period, often linked to a common source or transmission pattern. Recognizing it early allows teams to act before more people are affected.

Question 37

What steps are typically included in an initial outbreak investigation?

Accepted Answer

An initial investigation confirms the outbreak, defines a case, and creates a line list of affected people with dates, locations, and shared exposures. Teams review possible sources and transmission pathways, implement interim control measures, and report findings to infection prevention leadership and public health authorities as required.

Question 38

What is a case definition, and why is it used during surveillance?

Accepted Answer

A case definition is a set of standard criteria, often based on clinical findings, laboratory results, timing, and location, used to decide whether a person counts as a case. Consistent definitions make data comparable across units and over time, and they reduce disagreement about who should be included in an investigation.

Question 39

What is an infection prevention bundle, and what makes it effective?

Accepted Answer

An infection prevention bundle is a small set of evidence-based practices performed together for a specific procedure or care setting. Bundles tend to work best when every element is completed consistently, each step is checked, and the team reviews compliance data regularly, because partial completion often gives little benefit.

Question 40

What is the role of antimicrobial stewardship in infection prevention?

Accepted Answer

Antimicrobial stewardship is a coordinated effort to ensure that antimicrobial medicines are used only when indicated, with appropriate selection and duration. Limiting unnecessary use helps slow the spread of resistant organisms and reduces avoidable harm, and nurses contribute by reporting concerns and supporting follow-up reviews.

Question 41

Why must occupational exposures such as needlestick injuries be reported promptly?

Accepted Answer

Prompt reporting allows the worker to receive timely evaluation, follow-up, and any post-exposure care that the facility's protocol provides. It also allows the facility to investigate the cause, such as a device design or workflow problem, and to prevent similar events. Reports are documented confidentially and fed into quality data.

Infection Control Nursing Flashcards

1Foundations of Transmission

2Hand Hygiene and Protective Equipment

3Standard and Transmission-Based Precautions

4Environmental Cleaning and Sterilization

5Surveillance, Outbreak Response, and Quality Systems

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