Temperature Excursion During Vaccine Delivery
A pharmacy receives a shipment of vaccines on a Monday morning. The shipping container includes a digital data logger that recorded the temperature every 5 minutes during transit. The logger shows that the temperature was 5°C for the first 6 hours, then rose to 9°C for 2 hours, then returned to 5°C for the remaining 4 hours. The vaccines in the shipment include MMR (measles, mumps, rubella), varicella, and inactivated influenza vaccine. The pharmacy's vaccine storage and handling SOP states that any excursion above 8°C for more than 1 hour requires immediate action. The pharmacy manager is not available, and you are the senior technician on duty.
1. What immediate actions should you take upon discovering the temperature excursion?
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- Do not discard the vaccines. Label them 'Do Not Use' and segregate them from usable stock.
- Document the excursion: Record the time, temperature, and duration (9°C for 2 hours). Save the data logger readings.
- Notify the pharmacist in charge (or manager) immediately, even if off-site.
- Contact the manufacturer(s) for guidance on stability and whether the vaccines can be used. Provide the exact temperature and duration.
- Assess the vaccines: MMR and varicella are live vaccines and may be more sensitive to heat; inactivated influenza is generally more stable but still requires evaluation.
- Follow the manufacturer's recommendations regarding whether to use, discard, or replace the vaccines. Do not administer until cleared.
- Review storage and handling procedures to prevent recurrence and complete an incident report.
2. How would you determine if the vaccines are still viable for use?
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Viability depends on the vaccine's stability data and the manufacturer's guidance. Steps:
- Consult the manufacturer's package insert for storage requirements and stability information.
- Use the CDC Vaccine Storage and Handling Toolkit or manufacturer's stability studies to assess the impact of the specific excursion (9°C for 2 hours).
- Contact the manufacturer directly if the insert does not cover the excursion; they can provide a stability assessment.
- Consider the type of vaccine: Live vaccines (MMR, varicella) are generally more heat-sensitive than inactivated vaccines. However, the manufacturer may have data showing that short excursions are acceptable.
- Do not rely on visual inspection alone; some vaccines may not show visible changes.
- If the manufacturer confirms stability, document the approval and use the vaccines. If not, discard them according to biohazard waste procedures and document the loss.