CBIC Environmental Cleaning 3 — Questions and Answers
Question 1: During an outbreak of norovirus on an inpatient unit, which cleaning product is MOST appropriate for environmental decontamination?
- Quaternary ammonium compound (QAC)
- Accelerated hydrogen peroxide
- Sodium hypochlorite solution (Correct answer)
- Phenolic-based disinfectant
Correct answer: Sodium hypochlorite solution
Norovirus is resistant to many common disinfectants; EPA-registered sodium hypochlorite (bleach) products are highly effective and recommended during outbreaks.
Question 2: Which high-touch surface in a patient room has been consistently identified in studies as most frequently missed during manual cleaning?
- Window sills
- Call light buttons and TV remotes (Correct answer)
- Ceiling light fixtures
- Room entrance doors (exterior)
Correct answer: Call light buttons and TV remotes
Call light buttons and TV remotes are among the most frequently touched and most often missed objects in patient room cleaning audits.
Question 3: Which cleaning audit method involves applying a fluorescent gel to surfaces before cleaning and checking for removal under UV light?
- ATP bioluminescence assay
- Aerobic colony count culture
- Fluorescent marker method (Correct answer)
- Direct observation checklist
Correct answer: Fluorescent marker method
The fluorescent marker (gel or lotion) method is a visual audit tool that reveals missed surfaces by detecting residual fluorescent material under UV light after cleaning.
Question 4: A disinfectant label states it requires a 10-minute contact time. The EVS staff sprays the surface and wipes it dry after 30 seconds. This practice:
- Is acceptable because the surface appears visually clean
- Fails to achieve the labeled level of disinfection (Correct answer)
- Achieves the same result if a higher concentration is used
- Is acceptable for non-critical surfaces only
Correct answer: Fails to achieve the labeled level of disinfection
Wiping the surface before the labeled contact time is met prevents adequate microbial kill, regardless of visual cleanliness.
Question 5: When performing terminal cleaning of an Airborne Infection Isolation Room (AIIR), EVS staff should:
- Begin immediately after the patient leaves the room
- Wait for the required air changes to occur before entering (Correct answer)
- Enter with standard surgical mask and gloves only
- Open the door and windows to speed up air clearance
Correct answer: Wait for the required air changes to occur before entering
Staff must wait for the recommended number of air changes per hour (ACH) to clear the room before entering to minimize exposure to airborne pathogens.
Question 6: Which of the following BEST describes the 'clean-to-dirty' principle in environmental cleaning?
- Using clean water before dirty water in the mop bucket
- Cleaning less contaminated areas before more contaminated areas (Correct answer)
- Applying disinfectant to a clean surface before a soiled surface
- Replacing cleaning cloths only when visibly soiled
Correct answer: Cleaning less contaminated areas before more contaminated areas
The clean-to-dirty principle directs staff to clean less contaminated areas first to avoid spreading pathogens from heavily contaminated zones.
Question 7: Which regulatory body registers disinfectants used in U.S. healthcare facilities and sets the standards for efficacy claims?
- The Joint Commission (TJC)
- Occupational Safety and Health Administration (OSHA)
- Environmental Protection Agency (EPA) (Correct answer)
- Centers for Disease Control and Prevention (CDC)
Correct answer: Environmental Protection Agency (EPA)
The EPA regulates and registers all antimicrobial pesticides (including disinfectants) used in the U.S. and approves efficacy claims on product labels.
CBIC Environmental Cleaning 3
During an outbreak of norovirus on an inpatient unit, which cleaning product is MOST appropriate for environmental decontamination?