📌 Japanese Encephalitis Vaccine – As Licensed
📄 Description:
The Japanese Encephalitis (JE) vaccine provides active immunization against Japanese Encephalitis virus (JEV) — a mosquito-borne flavivirus that causes encephalitis, primarily in rural and agricultural areas of Asia, including India.
There are two main types licensed:
- Live attenuated vaccine (e.g., SA 14-14-2 strain)
- Inactivated Vero cell-derived vaccine (e.g., JENVAC)
💊 Prescription/Use:
- Indication: Prevention of Japanese encephalitis in infants, children, and adults living in or traveling to endemic areas.
- Recommended Age (as per India’s Universal Immunization Programme – UIP):
- 1st dose: at 9–12 months
- 2nd dose: at 16–24 months
- Route of Administration:
- Subcutaneous (SC) or Intramuscular (IM), depending on the vaccine type
- Dosage: 0.5 mL per dose
- Schedule:
- Live-attenuated: Single dose with booster
- Inactivated: Two doses, 4 weeks apart
🔬 Nature:
- Type:
- Live attenuated (e.g., SA 14-14-2) or
- Inactivated Vero-cell derived (e.g., JENVAC)
- Form:
- Liquid or lyophilized (powder that needs reconstitution)
- Content: Inactivated or attenuated JEV antigens with/without adjuvants
🌟 Advantages:
- Prevents severe, often fatal encephalitis
- Reduces burden of hospitalization and long-term neurological damage
- Safe and effective in infants and adults
- Part of national immunization programs in endemic regions
- Long-lasting immunity after full dosing
📦 Package:
- Single-dose or multi-dose vials
- Lyophilized vaccines come with a separate diluent
- Pack includes vial, syringe (sometimes), package insert, and vial monitor (VVM)
- Clearly labeled with expiry, batch number, and manufacturer info
🧊 Storage:
- Store between +2°C to +8°C (Refrigerator)
- Do not freeze
- Protect from light
- Use reconstituted vaccine within 4–6 hours if refrigerated
- Discard any unused vaccine after that time
⚠️ Precautions:
- Contraindicated in:
- Persons with severe allergic reaction to previous JE vaccine or any component
- Pregnant women (for live vaccines)
- Severe acute illness – delay vaccination
- Observe aseptic technique when administering
- Monitor patient for 30 minutes post-injection for any adverse reaction
- Reconstitute and administer vaccine strictly as per the manufacturer’s guidelines
👩⚕️ Patient Advice:
- Mild fever, headache, or soreness at injection site may occur — usually resolves in 1–2 days
- Take paracetamol if advised for fever
- Ensure both doses are taken (for inactivated vaccine)
- Report any severe symptoms like high fever, vomiting, altered behavior, or seizures immediately
- Keep vaccination card updated
- Avoid mosquito bites in endemic areas even after vaccination