APHA Cold Chain Management & Vaccine Storage 3 — Questions and Answers
Question 1: A power outage occurs at a clinic at 5 PM on a Friday. The refrigerator has a calibrated data logger and insulated walls. What is the most appropriate immediate action?
- Immediately transfer all vaccines to a backup cooler with ice packs
- Keep the refrigerator door closed and monitor temperature; transfer only if temperature rises above 8°C (Correct answer)
- Discard all vaccines since power cannot be restored until Monday
- Contact the manufacturer for guidance before doing anything
Correct answer: Keep the refrigerator door closed and monitor temperature; transfer only if temperature rises above 8°C
Keeping the refrigerator door closed preserves cold as long as possible; vaccines should be transferred to a backup unit only if temperature rises out of range.
Question 2: The 'shake test' (agitation test) is used to identify freezing damage in which type of vaccine?
- Live attenuated oral vaccines
- mRNA vaccines
- Adjuvanted inactivated vaccines (Correct answer)
- Recombinant subunit vaccines
Correct answer: Adjuvanted inactivated vaccines
The shake test detects flocculation (clumping) caused by freeze-damaged adjuvant in inactivated vaccines such as hepatitis B and DTaP.
Question 3: Which temperature range is required for storing varicella vaccine?
- -50°C to -15°C
- +2°C to +8°C
- -15°C to -25°C (freezer, ≤-15°C) (Correct answer)
- 0°C to +4°C
Correct answer: -15°C to -25°C (freezer, ≤-15°C)
Varicella vaccine must be stored frozen at -15°C or colder (optimally -25°C to -15°C), separate from refrigerated vaccines.
Question 4: How often should a certified calibration report be obtained for a digital data logger used in vaccine storage?
- Every 6 months
- Every year or per manufacturer recommendation, whichever is sooner (Correct answer)
- Every 2 years
- Only when the device is first purchased
Correct answer: Every year or per manufacturer recommendation, whichever is sooner
CDC recommends data loggers be calibrated annually or per manufacturer specifications to ensure measurement accuracy.
Question 5: A nurse notices that the alarm on the vaccine refrigerator was disabled by a colleague 'to stop the beeping.' What is the appropriate response?
- Leave it disabled if temperatures appear stable on the thermometer
- Re-enable the alarm immediately and document the incident (Correct answer)
- Replace the entire refrigeration unit
- Notify administration but wait for the next audit to address it
Correct answer: Re-enable the alarm immediately and document the incident
Alarms must remain active to alert staff of excursions; disabling them is a cold chain protocol violation that must be corrected and documented immediately.
Question 6: What does the term 'vaccine cold chain coordinator' refer to in a clinic setting?
- The vaccine manufacturer's representative responsible for shipping
- A designated staff member accountable for cold chain management at that site (Correct answer)
- A state health department inspector who audits storage quarterly
- The refrigerator technician who services the unit
Correct answer: A designated staff member accountable for cold chain management at that site
Each immunization site should designate a primary and backup vaccine coordinator responsible for storage, monitoring, and emergency response.
Question 7: Which situation would make a vaccine refrigerator NON-compliant with CDC storage guidelines?
- Having a digital data logger inside
- Storing water bottles on the door (Correct answer)
- Storing vaccines in the original manufacturer packaging
- Using a stand-alone pharmaceutical-grade unit
Correct answer: Storing water bottles on the door
Door shelves have the most temperature variability and should not be used to store vaccines or as vaccine buffer material that occupies vaccine space.
APHA Cold Chain Management & Vaccine Storage 3
A power outage occurs at a clinic at 5 PM on a Friday.
The refrigerator has a calibrated data logger and insulated walls.
What is the most appropriate immediate action?