APHA Cold Chain Management 2 — Questions and Answers
Question 1: A digital data logger shows the refrigerator temperature reached 9°C for 3 hours overnight. What is the FIRST action the immunization coordinator should take?
- Discard all vaccines immediately
- Quarantine the vaccines and contact the state/local health department or manufacturer (Correct answer)
- Return vaccines to the recommended storage temperature and continue use
- Document the excursion and monitor for another 24 hours before deciding
Correct answer: Quarantine the vaccines and contact the state/local health department or manufacturer
Vaccines should be quarantined and labeled 'do not use' while contacting the health department or manufacturer to assess viability—never discard without guidance.
Question 2: Which type of thermometer is considered the gold standard for vaccine storage monitoring according to CDC guidance?
- Alcohol-based glass thermometer
- Bi-metal stem thermometer
- Digital data logger with current, minimum, and maximum display (Correct answer)
- Infrared non-contact thermometer
Correct answer: Digital data logger with current, minimum, and maximum display
Digital data loggers that display current, minimum, and maximum temperatures provide continuous monitoring and are CDC's recommended standard.
Question 3: When packing a vaccine transport cooler, vaccines should be placed in relation to ice packs in which of the following ways?
- Directly against frozen ice packs to maximize cooling
- Separated from ice packs by insulating material to prevent freezing (Correct answer)
- At the bottom of the cooler beneath all ice packs
- Mixed randomly throughout the cooler for even temperature distribution
Correct answer: Separated from ice packs by insulating material to prevent freezing
Vaccines must be separated from ice packs with a barrier (e.g., bubble wrap or cardboard) to prevent freezing damage, especially to freeze-sensitive vaccines.
Question 4: What is the recommended temperature range for storing most refrigerated vaccines?
- 0°C to 4°C (32°F to 39°F)
- 2°C to 8°C (36°F to 46°F) (Correct answer)
- 4°C to 10°C (39°F to 50°F)
- 6°C to 12°C (43°F to 54°F)
Correct answer: 2°C to 8°C (36°F to 46°F)
The recommended refrigerator storage range for vaccines is 2°C to 8°C (36°F to 46°F) per CDC and manufacturer guidelines.
Question 5: A provider discovers that a stand-alone freezer storing varicella vaccine has been accidentally turned off for an unknown duration and the vaccines have completely thawed. What should be done?
- Refreeze the vaccines and document the incident
- Use the vaccines within 72 hours since varicella tolerates brief thawing
- Quarantine vaccines and consult the manufacturer or health department before use (Correct answer)
- Discard immediately without consultation since all thawed vaccines are unusable
Correct answer: Quarantine vaccines and consult the manufacturer or health department before use
Even for freeze-sensitive or previously frozen vaccines, providers must quarantine and consult the manufacturer or health department to determine usability.
Question 6: Which of the following locations within a refrigerator should vaccines NEVER be stored?
- Middle shelves away from walls
- Designated vaccine-only drawers
- The door shelves (Correct answer)
- Areas with a dedicated data logger probe
Correct answer: The door shelves
Refrigerator door shelves are subject to temperature fluctuations every time the door opens and should never be used for vaccine storage.
Question 7: How often should vaccine storage unit temperatures be manually reviewed by staff, in addition to automated data logger monitoring?
- Once per week
- Once per day at opening only
- At the start and end of each workday (Correct answer)
- Every 2 hours throughout the day
Correct answer: At the start and end of each workday
CDC recommends manually reviewing and recording temperatures at the start and end of each workday to catch issues in real time.
APHA Cold Chain Management 2
A digital data logger shows the refrigerator temperature reached 9°C for 3 hours overnight.
What is the FIRST action the immunization coordinator should take?