ESSENTIAL VACCINES BEFORE ENTERING GRADE 1

Reviewed by Dr. Tran Thi Tu Hang – Pediatric Specialist (Level 1). 

As children prepare to start Grade 1, their immune systems are at a critical developmental stage. Many vaccines administered in early childhood may no longer offer full protection due to waning immunity over time. 

✳️ RECOMMENDED VACCINES AND BOOSTERS BEFORE GRADE 1 

1.  INFLUENZA VACCINE 
Why: Flu viruses mutate rapidly and cause highly contagious seasonal outbreaks. Vaccines from previous years may not protect against new strains. WHO and CDC update flu vaccine compositions annually. 
Recommendation: An annual flu shot helps maintain strong protection against new virus strains. 

2. MEASLES – MUMPS – RUBELLA (MMR) 
Why: The first MMR dose is typically given at 12–15 months. Antibody levels may decline over time, especially if the immune response was incomplete. 
Recommendation: A second dose at 4–6 years is crucial to boost antibody levels, strengthen immune memory, and ensure long-term protection. 

3. VARICELLA (CHICKENPOX) 
Why: The first dose (usually at 12–15 months) provides effective immunity for only 80–85% of children. In schools, chickenpox spreads easily—with up to 90% transmission upon close contact. 
Recommendation: A second dose at 4–6 years increases immunity to 98–99%, helping prevent outbreaks. 

4. DIPHTHERIA – PERTUSSIS – TETANUS – POLIO (DTaP-IPV) 
Why: Although the primary series is given before age 2, immunity may wane after 3–5 years. 
Recommendation: A booster at 4–6 years helps maintain long-lasting protection. 

❓ WHY ARE TIMELY BOOSTER SHOTS IMPORTANT? 

Each vaccine offers protection for a limited time. On-time boosters help to: 

• Reactivate the immune system and build strong antibody levels 

• Prevent infections and reduce complications in school settings 

• Protect against severe outcomes like encephalitis, pneumonia, paralysis, hearing loss, and infertility 

❗ RISKS OF DELAYED OR MISSED VACCINATION 

• Inadequate protection due to low antibody levels 

• Loss of active immunity 

• Higher risk of spreading disease within the community 

✅ ADVICE FROM DR. TRAN THI TU HANG, PEDIATRIC SPECIALIST 

📍 Before your child starts Grade 1: 

• Review their vaccination records to check for any missing or overdue doses 

• Consult a pediatrician or immunization specialist for a tailored booster plan 

• Schedule vaccinations early to ensure your child is fully protected before entering school