The 'ice-lined refrigerator' (ILR) in the cold chain system for vaccines is designed to maintain temperature between:
- A 2°C to 8°C ✓
- B −15°C to −25°C
- C 0°C to 4°C
- D −2°C to 2°C
Correct answer: A. 2°C to 8°C
Explanation
Ice-lined refrigerators (ILRs) maintain a temperature of 2–8°C and are used at district and PHC/CHC levels to store most vaccines (DPT, Hep B, IPV, measles-rubella, BCG, TT). They are passively cooled by ice lining the inner walls, allowing them to maintain temperature for up to 42–72 hours during power failure. Deep freezers (−15°C to −25°C) are used at higher levels (state, district) specifically for OPV and lyophilised vaccines requiring freezing.
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.