**Question:** The peripheral workers in a primary health centre return one day late; after an immunisation session. The primary health centre is locked. The vaccine carrier still contains a few unopened ls of DPT vaccine and sufficient ice. The workers are to?

A. Discard the vaccine
B. Continue the immunisation session with the remaining unopened vials
C. Store the vaccine at room temperature
D. Return the vaccine to the central health centre

**Correct Answer:** B. Continue the immunisation session with the remaining unopened vials

**Core Concept:** Vaccines storage and handling

**Why the Correct Answer is Right:** When dealing with vaccines, maintaining the correct storage temperature is crucial to maintain their potency and efficacy. In this scenario, the vaccine carrier has unopened vials of DPT vaccine along with sufficient ice to maintain the required temperature (usually 2-8°C). The peripheral workers have to continue the immunisation session with the remaining unopened vials because:

1. The ice in the vaccine carrier is still present, ensuring that the temperature remains within the acceptable range for vaccine storage.
2. The unopened vials maintain their potency and efficacy, ensuring that the immunisation session can proceed without compromising the quality of the vaccine.

**Why Each Wrong Option is Incorrect:**

A. Discarding the vaccine is not necessary as the ice in the vaccine carrier maintains the required temperature and the unopened vials are still functional.

B. Storing vaccines at room temperature can lead to denaturation of the vaccine components, reducing their potency and efficacy. In this case, the correct answer is to continue the session with the remaining unopened vials and ensure proper storage with the ice.

C. Storing vaccines at room temperature can lead to denaturation of vaccine components, reducing their potency and efficacy. In this case, the correct answer is to continue the session with the remaining unopened vials and ensure proper storage with the ice.

D. Returning the vaccine to the central health centre is not the correct option since the vaccine is still functional with the unopened vials and proper ice storage.

**Clinical Pearl:**

It is crucial for healthcare workers to be aware of proper vaccine storage and handling protocols. Inadequate vaccine storage can lead to reduced vaccine efficacy and potency, potentially compromising the health of the individuals receiving the vaccine. Ensuring that vaccines are stored at the correct temperature and used within their recommended timeframe is critical for effective immunisation programs.