Question 1: What is the Spaulding Classification system used for in infection prevention?

• Classifying healthcare-associated infections
• Categorizing medical devices based on infection risk to determine disinfection or sterilization level required (Correct answer)
• Ranking hospitals by infection rates
• Classifying antibiotic resistance patterns

Correct answer: Categorizing medical devices based on infection risk to determine disinfection or sterilization level required

The Spaulding Classification categorizes devices as critical, semi-critical, or non-critical based on infection risk from their use.

Critical items contact sterile tissue (require sterilization), semi-critical contact mucous membranes (require high-level disinfection), non-critical contact intact skin (require low-level disinfection).

Question 2: What are the five moments for hand hygiene as defined by the WHO?

• Before eating, after eating, before sleeping, after sleeping, after restroom
• Before patient contact, before aseptic task, after body fluid exposure, after patient contact, after touching patient surroundings (Correct answer)
• Before shift, at lunch, mid-afternoon, before leaving, after emergencies
• Before gloving, after gloving, before masking, after masking, at shift end

Correct answer: Before patient contact, before aseptic task, after body fluid exposure, after patient contact, after touching patient surroundings

WHO five moments: before touching patient, before clean/aseptic procedures, after body fluid exposure risk, after touching patient, after touching patient surroundings.

Each moment targets a specific transmission risk. Hand hygiene can be alcohol-based hand rub (preferred when hands not visibly soiled) or soap and water.

Question 3: What type of precautions should be implemented for a patient diagnosed with pulmonary tuberculosis?

• Standard precautions only
• Contact precautions
• Airborne precautions (Correct answer)
• Droplet precautions

Correct answer: Airborne precautions

Pulmonary TB requires airborne precautions because M. tuberculosis is transmitted via airborne nuclei that remain suspended in the air.

Airborne precautions require an Airborne Infection Isolation Room with negative pressure, at least 12 air changes per hour, and N95 respirators for healthcare workers.

Question 4: What is the minimum bleach concentration recommended by CDC for disinfecting surfaces contaminated with C. difficile?

• 1:100 dilution (500 ppm)
• 1:10 dilution (5,000 ppm) or EPA-registered sporicidal product (Correct answer)
• Undiluted bleach
• Bleach is not effective against C. difficile

Correct answer: 1:10 dilution (5,000 ppm) or EPA-registered sporicidal product

CDC recommends 1:10 dilution of sodium hypochlorite (5,000 ppm) or EPA-registered sporicidal product for C. difficile spores.

C. difficile spores resist most standard disinfectants including quaternary ammonium and alcohol. Hand washing with soap and water is required as alcohol rub does not kill spores.

Question 5: What is an Infection Control Risk Assessment (ICRA) matrix used for in healthcare construction?

• To determine operating room needs
• To evaluate infection risk from construction and determine appropriate precautions based on patient population and project type (Correct answer)
• To calculate construction costs
• To schedule infection control staff coverage

Correct answer: To evaluate infection risk from construction and determine appropriate precautions based on patient population and project type

The ICRA matrix cross-references construction activity type with patient risk group to determine the appropriate class of precautions.

Construction activities and patient risk groups are cross-referenced to determine Class I through Class IV precautions, with Class IV being the most stringent.

Question 6: What is the proper order for donning PPE when entering a patient room under contact and droplet precautions?

• Mask, gloves, gown, eye protection
• Gown, mask or respirator, eye protection, gloves (Correct answer)
• Gloves, gown, mask, eye protection
• Eye protection, gloves, mask, gown

Correct answer: Gown, mask or respirator, eye protection, gloves

The correct donning sequence is gown first, then mask/respirator, then eye protection, and gloves last to cover the gown cuffs.

Putting gloves on last ensures they cover the gown cuffs, creating a continuous barrier. Doffing is essentially the reverse, with gloves and gown removed first.

Question 7: What is the purpose of an antibiotic stewardship program in a healthcare facility?

• To increase antibiotic prescriptions
• To optimize antibiotic use to improve patient outcomes, reduce antimicrobial resistance, and decrease healthcare-associated infections (Correct answer)
• To eliminate all antibiotic use
• To transfer prescribing authority from physicians to pharmacists

Correct answer: To optimize antibiotic use to improve patient outcomes, reduce antimicrobial resistance, and decrease healthcare-associated infections

Antibiotic stewardship programs optimize prescribing to ensure the right drug, dose, and duration while reducing unnecessary use that drives resistance.

Now required by The Joint Commission and CMS. Core elements include leadership commitment, accountability, pharmacy expertise, tracking, reporting, and education. Programs reduce C. diff infections by 30-50%.

Question 8: What is the significance of the surgical site infection surveillance window?

• The time during surgery when the incision is open
• The defined post-operative surveillance period during which an infection is attributed to the surgical procedure (Correct answer)
• The window in the operating room
• The time between scheduling and performing surgery

Correct answer: The defined post-operative surveillance period during which an infection is attributed to the surgical procedure

The SSI window is the defined period after surgery (30 or 90 days depending on procedure) during which infections are classified as procedure-related.

NHSN defines 30-day surveillance for most procedures and 90 days for procedures involving implants. SSIs are classified as superficial, deep incisional, or organ/space.

Question 9: Which sterilization method is most commonly used for heat-stable surgical instruments?

• Chemical immersion in glutaraldehyde
• Ultraviolet light exposure
• Steam sterilization (autoclaving) (Correct answer)
• Dry heat sterilization

Correct answer: Steam sterilization (autoclaving)

Steam sterilization using autoclaves is the most common, reliable, and cost-effective method for heat-stable surgical instruments.

Steam sterilization exposes items to saturated steam under pressure at 121-134 degrees Celsius. Quality assurance involves mechanical, chemical, and biological indicators.

Question 10: What does healthcare-associated infection (HAI) specifically refer to?

• Any infection when admitted
• An infection acquired during healthcare treatment that was not present or incubating at admission (Correct answer)
• Only antibiotic-resistant infections
• Only ICU infections

Correct answer: An infection acquired during healthcare treatment that was not present or incubating at admission

HAIs are infections that develop during healthcare delivery and were not present or incubating at admission.

Common HAIs include CLABSIs, CAUTIs, SSIs, VAP, and C. diff infections. They affect approximately 1 in 31 hospital patients on any given day.

Question 11: What is the purpose of performing environmental cultures in a healthcare facility?

• To routinely test all surfaces daily
• To investigate suspected environmental sources during outbreaks or to validate disinfection processes (Correct answer)
• To replace hand hygiene monitoring
• To determine room temperature levels

Correct answer: To investigate suspected environmental sources during outbreaks or to validate disinfection processes

Environmental cultures are used during outbreak investigations and to validate cleaning and disinfection effectiveness.

CDC does not recommend routine surface cultures. Indications include outbreak investigation (Legionella, MRSA), validating sterile processing, and monitoring water quality.

Question 12: What is a bundle approach in infection prevention, such as the central line insertion bundle?

• Unrelated best practices bundled for convenience
• A small set of evidence-based practices that when implemented together consistently result in better outcomes than individually (Correct answer)
• A package deal for purchasing supplies
• A staff scheduling approach

Correct answer: A small set of evidence-based practices that when implemented together consistently result in better outcomes than individually

Care bundles are structured groups of 3-5 evidence-based interventions that produce significantly better outcomes when implemented together and consistently.

Developed by IHI, bundle compliance is measured all-or-nothing. The central line bundle includes hand hygiene, maximal barrier precautions, chlorhexidine skin antisepsis, optimal site selection, and daily line necessity review.

Question 13: A patient is placed on contact precautions for MRSA. Which action by the nursing assistant requires immediate correction?

• Wearing gloves before entering the room
• Donning a gown before patient contact
• Removing PPE inside the patient room before exiting (Correct answer)
• Performing hand hygiene after removing gloves

Correct answer: Removing PPE inside the patient room before exiting

PPE must be removed before exiting the patient room, not inside it, to avoid contaminating the hallway environment.

Question 14: Which organism is the most common cause of healthcare-associated pneumonia in ventilated patients?

• Staphylococcus aureus
• Pseudomonas aeruginosa (Correct answer)
• Clostridioides difficile
• Candida albicans

Correct answer: Pseudomonas aeruginosa

Pseudomonas aeruginosa is the most frequently implicated gram-negative organism in ventilator-associated pneumonia (VAP) in healthcare settings.

Question 15: An infection preventionist is evaluating surgical site infection (SSI) rates. Which pre-operative measure has the strongest evidence for reducing SSI risk?

• Administering prophylactic antibiotics within 60 minutes before incision (Correct answer)
• Shaving the surgical site the night before surgery
• Applying iodine-based skin prep exclusively
• Keeping the OR temperature below 65°F

Correct answer: Administering prophylactic antibiotics within 60 minutes before incision

Timely prophylactic antibiotic administration within 60 minutes before incision is the highest-evidence intervention for SSI prevention.

Question 16: Under CDC guidelines, which of the following surfaces in a patient room is considered a 'high-touch' surface requiring more frequent disinfection?

• Ceiling tiles
• Window blinds
• Call button and bed rails (Correct answer)
• Baseboards

Correct answer: Call button and bed rails

Call buttons and bed rails are high-touch surfaces that patients and staff contact frequently, making them priority targets for disinfection.

Question 17: A healthcare worker develops a needlestick injury from a patient with unknown HIV status. What is the first immediate action?

• Immediately start post-exposure prophylaxis (PEP)
• Wash the wound thoroughly with soap and water (Correct answer)
• Notify the infection control department
• Draw blood from the source patient

Correct answer: Wash the wound thoroughly with soap and water

Immediate and thorough washing of the wound with soap and water is the first step following a needlestick or sharps injury.

Question 18: Which disinfectant level is required for semi-critical medical devices such as endoscopes used on intact mucous membranes?

• Low-level disinfection
• Intermediate-level disinfection
• High-level disinfection (Correct answer)
• Sterilization

Correct answer: High-level disinfection

Semi-critical devices contact mucous membranes and require high-level disinfection to eliminate all microorganisms except high levels of bacterial spores.

Question 19: An outbreak of Clostridioides difficile is identified on a medical unit. Which hand hygiene agent is specifically recommended over alcohol-based hand rub for C. diff situations?

• Chlorhexidine gluconate solution
• Soap and water (Correct answer)
• Povidone-iodine scrub
• Quaternary ammonium compound

Correct answer: Soap and water

Soap and water is preferred for C. difficile because alcohol-based hand rubs do not effectively remove spores, whereas soap and water physically removes them.