## Cold Chain Stability and Open-Vial Policy for OPV **Key Point:** According to WHO Multi-Dose Vial Policy (MDVP) and India's Universal Immunization Programme (UIP) guidelines, an opened vial of Oral Polio Vaccine (OPV) can be used for **up to 6 hours** after opening, provided it has been stored at appropriate temperatures (2–8°C or ambient temperatures up to ~25–28°C for limited periods), the expiry date has not passed, and there are no signs of contamination or discoloration. In this scenario, the vial was opened **4 hours ago** at **28°C**, has **no visible discoloration or particulate matter**, and the expiry date is presumably valid. Therefore, the vial is still within the permissible 6-hour window and **can be used immediately**. ## WHO Multi-Dose Vial Policy (MDVP) — High-Yield Summary | Vaccine Type | Open-Vial Stability (Room Temp) | |---|---| | OPV | Up to **6 hours** | | BCG | Discard at end of session (4–6 hours) | | Measles/MMR | Discard within **6 hours** | | DPT/TT/Hep B | Up to **4 weeks** (if cold chain maintained) | **High-Yield:** The WHO MDVP (revised 2014) and India's UIP guidelines specify that OPV vials, once opened, remain usable for **6 hours** at ambient temperatures, not 2 hours. The 2-hour rule is sometimes misquoted but does NOT apply to OPV under current WHO/UIP policy. ## Why Other Options Are Incorrect - **Option A (Discard; 2-hour limit):** Incorrect. The 2-hour open-vial limit is NOT the current WHO/UIP guideline for OPV. The correct limit is 6 hours at room temperature. - **Option B (Refrigerate and use within 24 hours):** Incorrect. Once a multi-dose vial has been opened and used at room temperature, it should not be re-refrigerated and held for 24 hours; this is not standard MDVP practice for OPV. - **Option C (Contraindicated in lactating women):** Incorrect. OPV is **not** contraindicated in breastfeeding women. Lactation is not a contraindication to any routine vaccine in the UIP schedule. ## Correct Management - **Use the vial immediately** — it is within the 6-hour open-vial window - **Document** the time of opening on the vial label (standard UIP practice) - **Discard** the vial if the 6-hour window is exceeded or if contamination is suspected **Clinical Pearl (WHO/UIP):** Health workers must mark the time of opening on every multi-dose vial. Vials should be discarded at the end of the immunization session or after 6 hours (whichever comes first) for OPV, even if vaccine remains in the vial. *(Reference: WHO MDVP 2014; India UIP Cold Chain Handbook, MoHFW)*
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