Community Medicine (PSM) · Immunization and Vaccines (Cold Chain, NIS Schedule, Open Vial Policy)

At a district store, the deep freezer compartment of the cold chain equipment maintains minus 15 to minus 25 degrees C. Which items are routinely stored in this compartment?

  • A Diluents for BCG and measles-rubella vaccines
  • B Measles-rubella, BCG and OPV vials
  • C All vaccines awaiting distribution to lower levels
  • D OPV vials and frozen ice packs
Correct answer: D. OPV vials and frozen ice packs

Explanation

The deep freezer at district and regional levels is used only for oral poliovirus vaccine, which tolerates freezing, and for freezing ice packs needed for transport. All other vaccines, including measles-rubella and BCG, are kept in the ice-lined refrigerator at plus 2 to plus 8 degrees C. Diluents must never be frozen; they are stored in the ILR or at room temperature and cooled before use.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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