Vaccines should be stored at what temperature–

Correct option is B

Sol. Most vaccines used in routine immunization, such as DPT, BCG, OPV, Hepatitis B, etc., are required to be stored at 2–6°C, which is the recommended temperature range for maintaining the cold chain. This range prevents vaccines from freezing or degrading due to heat. The 2–6°C temperature is maintained in ILRs (Ice Lined Refrigerators) and vaccine carriers during transportation.
Explanation of each option:
· (a) 0–4°C – Incorrect. This may result in freezing of freeze-sensitive vaccines like Hepatitis B and DPT, which can inactivate their potency.
· (b) 2–6°C – Correct. This is the WHO-recommended temperature range for storing most routine vaccines to ensure efficacy.
· (c) 2–8°C – Incorrect. While 2–8°C is seen in some extended ranges, 6°C is the upper safe limit for many vaccines; beyond this, potency can be affected.
· (d) 0–8°C – Incorrect. This broad range includes both freezing and overheating risk zones and is not safe for many vaccine types.