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← Community Medicine / 3rd Year / MBBS

OBSERVE / REASON / EXPLAIN

Vaccine cold-chain station

Assess a simulated cold-chain record and identify when to escalate a storage concern.

Original teaching scenario / OSCE

Your practical station

A teaching temperature log contains an unexplained overnight excursion. Describe the checks before any affected vaccine is used.

Recognise and interpret

Vaccine potency depends on product-specific handling and documented temperature control.

  • Review the correct product guidance
  • Check time and temperature records
  • Assess an excursion before release
1

Review

Identify the vaccine, storage instructions and monitoring records.

2

Contain

Follow the approved quarantine or hold procedure if an excursion is suspected.

3

Escalate

Seek the immunisation programme’s documented assessment; do not guess that a product remains usable.

At the viva table

Try answering aloud, then open the suggested answer. Examiner questions vary.

01 / Can all vaccines tolerate freezing?

No. Product sensitivities differ.

02 / Does normal appearance prove potency?

No. Visual appearance does not establish maintained potency.

03 / Why document duration as well as temperature?

Both can affect an excursion assessment.

04 / Should a suspect batch simply be used or discarded without review?

No. Follow the programme’s assessment and disposition procedure.

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