CBIC Environmental Cleaning 5 — Questions and Answers
Question 1: Which of the following pathogens can survive on dry inanimate surfaces for months, making rigorous environmental cleaning especially critical?
- Influenza A virus
- Clostridium difficile spores (Correct answer)
- Respiratory syncytial virus (RSV)
- Pseudomonas aeruginosa in planktonic form
Correct answer: Clostridium difficile spores
C. difficile spores are exceptionally resistant and can persist on surfaces for months, serving as a major environmental reservoir for transmission.
Question 2: When evaluating a new disinfectant for hospital use, which label claim is MOST relevant to confirming tuberculocidal activity?
- Kills 99.9% of bacteria in 30 seconds
- EPA-registered as a hospital disinfectant with tuberculocidal claim (Correct answer)
- Broad-spectrum bactericidal activity
- Effective against Gram-negative organisms
Correct answer: EPA-registered as a hospital disinfectant with tuberculocidal claim
A tuberculocidal claim on the EPA-registered label confirms the product meets efficacy standards for Mycobacterium tuberculosis, the most resistant non-spore-forming organism used as a disinfection benchmark.
Question 3: In the context of environmental cleaning, 'horizontal' surfaces in patient rooms are considered higher risk because they:
- Are more difficult to reach and often skipped by EVS
- Collect settling particles and are frequently touched, accumulating contamination (Correct answer)
- Require sporicidal agents for routine disinfection
- Are classified as semi-critical items under Spaulding's framework
Correct answer: Collect settling particles and are frequently touched, accumulating contamination
Horizontal surfaces collect airborne particles and are often hand-contact surfaces, making them significant reservoirs for pathogens.
Question 4: An ICP is reviewing an ATP monitoring program. A threshold of ≥250 relative light units (RLU) is flagged as a cleaning failure. This threshold is best described as:
- A universal CDC-mandated standard for all healthcare surfaces
- A facility-defined benchmark, with thresholds varying by surface type and institution (Correct answer)
- A microbiological colony count equivalent
- A fixed FDA regulatory requirement for patient care areas
Correct answer: A facility-defined benchmark, with thresholds varying by surface type and institution
ATP RLU thresholds are not universally mandated; each facility establishes benchmarks based on surface type, equipment, and local validation data.
Question 5: Which practice BEST reduces the risk of disinfectant resistance developing among healthcare pathogens?
- Rotating disinfectant classes monthly to prevent adaptation
- Using EPA-registered products at label-specified concentrations and contact times (Correct answer)
- Increasing disinfectant concentration above label recommendations for stronger effect
- Using a single disinfectant product consistently to build familiarity among EVS staff
Correct answer: Using EPA-registered products at label-specified concentrations and contact times
Using EPA-registered products at labeled concentrations and contact times ensures adequate microbial kill and reduces selective pressure for resistance development.
Question 6: A patient with VRE is discharged. The next patient admitted to the same room later acquires VRE colonization with no other exposure. This scenario MOST likely demonstrates:
- Airborne transmission of VRE from the previous patient
- Environmental surface transmission due to inadequate terminal cleaning (Correct answer)
- Contact transmission via a shared healthcare worker
- Endogenous VRE colonization in the newly admitted patient
Correct answer: Environmental surface transmission due to inadequate terminal cleaning
VRE can persist on surfaces; subsequent patient colonization without other exposure strongly suggests environmental contamination from inadequate terminal room decontamination.
Question 7: Which of the following statements about microfiber cleaning cloths in healthcare is CORRECT?
- They should be reused for multiple patient rooms without laundering to reduce waste
- They remove more microorganisms than cotton cloths and should be laundered between rooms (Correct answer)
- They are effective only when used with phenolic disinfectants
- They eliminate the need for chemical disinfectants when used with hot water
Correct answer: They remove more microorganisms than cotton cloths and should be laundered between rooms
Microfiber cloths have superior mechanical removal of microorganisms compared to cotton but must be laundered between patient rooms to prevent cross-contamination.
CBIC Environmental Cleaning 5
Which of the following pathogens can survive on dry inanimate surfaces for months, making rigorous environmental cleaning especially critical?