A 6-month-old male infant from rural Maharashtra presents to the immunisation clinic for routine vaccination. The child is healthy with no contraindications. The ANM (Auxiliary Nurse Midwife) informs the mother that today's vaccines include OPV (oral polio vaccine) and rotavirus vaccine. However, she notices that the OPV vial has been stored at 8°C in the refrigerator for the past 3 weeks since opening. The rotavirus vaccine vial was opened 2 weeks ago and stored at 2–8°C. Which vaccine should be discarded and why?

Question

Accepted Answer

C. Rotavirus only, because once opened, rotavirus vaccine must be used within 5 days at 2–8°C. ## Open-Vial Shelf Life (OVSL) in Cold Chain Management

**Key Point:** Open-vial shelf life (OVSL) is the maximum time a vaccine can be used after the vial is first opened, provided it is stored at the recommended temperature and handled aseptically.

### OVSL for Common Vaccines

| Vaccine | OVSL at 2–8°C | Notes |
|---------|---------------|-------|
| OPV (Oral Polio Vaccine) | 4 weeks | Multi-dose vial; stable once opened |
| Rotavirus vaccine | 5 days | Multi-dose vial; must be discarded after 5 days |
| DPT/Pentavalent | 4 weeks | Multi-dose vial |
| IPV | 4 weeks | Multi-dose vial |
| Hepatitis B | 4 weeks | Multi-dose vial |
| Measles/MR/MMR | 6 hours (once reconstituted) | Lyophilized; short OVSL after reconstitution |
| Varicella | 6 hours (once reconstituted) | Lyophilized; short OVSL after reconstitution |

**High-Yield:** Rotavirus vaccine has the SHORTEST open-vial shelf life (5 days) among routine immunisation vaccines in India. This is a frequently tested fact in NEET PG.

### Analysis of the Vignette

- **OPV:** Opened 3 weeks ago → Within 4-week OVSL → **Can be used**
- **Rotavirus:** Opened 2 weeks ago → **Exceeds 5-day OVSL** → **Must be discarded**

**Clinical Pearl:** The ANM must document the date and time of opening every vaccine vial. If the exact opening date is unknown, the vaccine should be discarded as a safety precaution.

**Warning:** Do not confuse open-vial shelf life with vaccine expiry date. A vaccine may have a valid expiry date but still be unsafe to use if the OVSL has been exceeded after opening.

**Mnemonic: "ROTA-5"** — Rotavirus vaccine has a 5-day open-vial shelf life, the shortest among routine vaccines.

Answer

A. OPV only, because once opened, OPV is stable for only 4 weeks at 2–8°C and loses potency after that

Answer

B. Neither vaccine needs to be discarded; both are stable for up to 6 weeks when stored at 2–8°C

Answer

D. Both vaccines should be discarded because both have exceeded their open-vial shelf life

Explanation

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