A cold chain handler at a PHC is checking the deep freezer used for OPV storage. The temperature log shows a reading of -18°C. Which of the following is the correct interpretation and action?
- A Temperature is too warm; transfer OPV to the ILR immediately
- B Temperature is acceptable; OPV can be stored at -20°C to -15°C in the deep freezer ✓
- C Temperature is too cold; move OPV to the cold box to prevent freezing damage
- D Temperature is acceptable only if the VVM is at Stage 1; otherwise discard the vial
Correct answer: B. Temperature is acceptable; OPV can be stored at -20°C to -15°C in the deep freezer
Explanation
OPV must be stored frozen at -20°C in the deep freezer at the district level and in the freezer compartment of the ILR at the PHC level. A reading of -18°C is within the acceptable frozen storage range. Option A is wrong because -18°C is not too warm for frozen OPV. Option C is wrong because OPV is a freeze-stable vaccine and does not suffer freezing damage. Option D is irrelevant because VVM status does not override a correct temperature reading.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.