CCBMA Infection Control and Safety 2 — Questions and Answers
Question 1: Which level of disinfection is required for semi-critical medical instruments that contact mucous membranes?
- Low-level disinfection
- High-level disinfection (Correct answer)
- Sterilization
- Sanitization only
Correct answer: High-level disinfection
Semi-critical items require high-level disinfection to eliminate all microorganisms except high numbers of bacterial spores.
Question 2: What is the correct donning order for PPE when entering an isolation room?
- Gloves, gown, mask, eye protection
- Gown, mask/respirator, eye protection, gloves (Correct answer)
- Mask, gloves, gown, eye protection
- Eye protection, gloves, gown, mask
Correct answer: Gown, mask/respirator, eye protection, gloves
Gown first, then mask/respirator, eye protection, and gloves last ensures hands do not contaminate the face before eye and respiratory protection is in place.
Question 3: A patient is diagnosed with active tuberculosis. Which type of isolation precautions should be implemented?
- Contact precautions
- Droplet precautions
- Airborne precautions (Correct answer)
- Standard precautions only
Correct answer: Airborne precautions
Tuberculosis is transmitted via airborne droplet nuclei and requires airborne precautions including a negative-pressure room and N95 respirator.
Question 4: Which agent is the most appropriate disinfectant for cleaning blood spills on environmental surfaces?
- Isopropyl alcohol 70%
- Bleach solution (1:10 dilution) (Correct answer)
- Hydrogen peroxide 3%
- Soap and water only
Correct answer: Bleach solution (1:10 dilution)
A 1:10 bleach solution is an EPA-registered disinfectant effective against bloodborne pathogens on hard surfaces.
Question 5: According to the chain of infection, which link is addressed when a patient receives an influenza vaccination?
- Reservoir
- Mode of transmission
- Susceptible host (Correct answer)
- Portal of entry
Correct answer: Susceptible host
Vaccination strengthens the susceptible host's immunity, breaking the chain of infection at that point.
Question 6: When removing (doffing) PPE, which item should be removed first?
- Mask
- Eye protection
- Gloves (Correct answer)
- Gown
Correct answer: Gloves
Gloves are removed first because they are the most contaminated item and removing them protects the hands before touching other PPE.
CCBMA Infection Control and Safety 2
Which level of disinfection is required for semi-critical medical instruments that contact mucous membranes?