According to the IAP Immunization Advisory Committee 2023 schedule, at what age is the second dose of chickenpox (varicella) vaccine recommended in healthy children, and what is the minimum interval between the two doses?
- A 4–6 years; minimum interval 3 months for children <13 years but 4 weeks for ≥13 years ✓
- B 4–6 years; minimum interval 3 months
- C 15–18 months; minimum interval 6 weeks after first dose at 12 months
- D Only one dose is needed in children receiving the vaccine before 13 years of age
Correct answer: A. 4–6 years; minimum interval 3 months for children <13 years but 4 weeks for ≥13 years
Explanation
The IAP 2023 schedule recommends two-dose varicella vaccination: first dose at 15 months (or as early as 12 months) and second dose at 4–6 years. For children <13 years, the minimum interval between doses is 3 months to ensure adequate immunological priming. For adolescents ≥13 years of age who are susceptible, two doses are given 4–8 weeks apart (minimum 4 weeks). Two-dose vaccination significantly reduces breakthrough varicella and achieves seroconversion rates of 99% compared to 85–90% with one dose.
Reference: Ghai Essential Pediatrics, 10th ed.
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Written and medically reviewed by the StethoPrep medical team.