CIC Environment of Care 5 — Questions and Answers
Question 1: Which statement correctly describes the difference between cleaning, disinfection, and sterilization in the healthcare environment?
- Cleaning kills all microorganisms; disinfection removes visible soil; sterilization eliminates spores
- Cleaning removes visible soil and reduces bioburden; disinfection kills most pathogens; sterilization eliminates all microbial life including spores (Correct answer)
- Disinfection and sterilization are interchangeable terms in the healthcare environment
- Sterilization is required for all patient-contact surfaces in the environment of care
Correct answer: Cleaning removes visible soil and reduces bioburden; disinfection kills most pathogens; sterilization eliminates all microbial life including spores
Cleaning removes physical soil and reduces bioburden; disinfection kills or inactivates most pathogens; sterilization achieves a sterility assurance level by eliminating all microbial life including spores.
Question 2: An infection preventionist is concerned about sink drain biofilm as a source of multidrug-resistant gram-negative organisms (MDROs) in a critical care unit. Which measure is most appropriate?
- Replacing all sinks with touchless models
- Performing periodic drain disinfection and investigating patient-to-sink proximity as a risk factor (Correct answer)
- Eliminating hand washing sinks and replacing with alcohol-based hand rub dispensers only
- Pouring bleach down all drains daily as standard practice
Correct answer: Performing periodic drain disinfection and investigating patient-to-sink proximity as a risk factor
Sink drains harbor biofilm and MDROs that can splash onto surfaces and hands; periodic disinfection and assessing sink proximity to high-risk procedures are evidence-based interventions.
Question 3: A healthcare facility identifies that housekeeping staff are not cleaning the underside of patient bed frames. What surveillance method would most objectively identify this gap?
- Direct observation of housekeeping staff during room cleaning
- Patient satisfaction surveys regarding room cleanliness
- Fluorescent marker or ATP bioluminescence monitoring of targeted surfaces (Correct answer)
- Reviewing housekeeping supply usage logs monthly
Correct answer: Fluorescent marker or ATP bioluminescence monitoring of targeted surfaces
Fluorescent marker or ATP bioluminescence monitoring provides objective, measurable evidence of cleaning thoroughness on specific surfaces without relying solely on direct observation.
Question 4: Which scenario represents appropriate use of a single-use disposable versus a reusable medical device in the environment of care?
- Reusing a single-use blood glucose lancet after disinfection with alcohol
- Reprocessing a reusable blood pressure cuff between patients per manufacturer instructions (Correct answer)
- Sharing a single-use suction catheter among multiple patients in the same room
- Reusing a single-use gown if it has no visible soiling
Correct answer: Reprocessing a reusable blood pressure cuff between patients per manufacturer instructions
Reusable blood pressure cuffs are designed and labeled for reprocessing between patients; reusing items labeled as single-use is a regulatory and patient safety violation.
Question 5: What is the purpose of monitoring pressure differentials between an AIIR and the hallway using a visual indicator (e.g., flutter strip or smoke test)?
- To confirm the room temperature meets regulatory standards
- To verify that the exhaust system is maintaining negative pressure relative to the corridor (Correct answer)
- To measure the humidity level inside the isolation room
- To detect carbon dioxide buildup from multiple occupants
Correct answer: To verify that the exhaust system is maintaining negative pressure relative to the corridor
Visual indicators confirm that airflow direction is inward (negative pressure), ensuring infectious aerosols cannot escape to the hallway when the door is briefly opened.
Question 6: During an environmental round, an IP notices standing water in a humidifier reservoir in a patient room. What is the primary infection risk?
- Electrical hazard from water near equipment
- Colonization and aerosolization of waterborne pathogens, particularly Pseudomonas and Legionella (Correct answer)
- Increased room humidity causing mold growth on walls only
- Dilution of airborne disinfectants reducing their efficacy
Correct answer: Colonization and aerosolization of waterborne pathogens, particularly Pseudomonas and Legionella
Standing water in humidifier reservoirs supports rapid proliferation of waterborne pathogens like Pseudomonas aeruginosa and Legionella, which can be directly aerosolized into patient breathing zones.
Question 7: A newly built bone marrow transplant unit is being commissioned. Which combination of ventilation parameters is required for the protective environment?
- Negative pressure, MERV 8 filtration, minimum 6 ACH
- Positive pressure, HEPA filtration, minimum 12 ACH, no recirculation from other areas (Correct answer)
- Neutral pressure, MERV 14 filtration, minimum 10 ACH
- Positive pressure, MERV 14 filtration, minimum 6 ACH
Correct answer: Positive pressure, HEPA filtration, minimum 12 ACH, no recirculation from other areas
CDC and ASHRAE 170 specify positive pressure, HEPA filtration (≥99.97%), and a minimum of 12 ACH with no recirculation from other areas for protective environment rooms serving severely immunocompromised patients.
CIC Environment of Care 5
Which statement correctly describes the difference between cleaning, disinfection, and sterilization in the healthcare environment?