Which vaccines are included in the 4-6 year booster series if not previously vaccinated?

• A. DTaP, IPV, MMR, and VAR
• B. DTaP and IPV only
• C. MMR and VAR only
• D. DTaP, IPV, and MMR (no VAR)

Answer: (A)

The main idea here is that the 4- to 6-year-old booster is designed to consolidate protection against several common diseases by giving a set of vaccines at one catch-up visit if the child hasn’t been vaccinated before. For a child not previously vaccinated, the complete catch-up at this age includes four vaccines: DTaP to protect against diphtheria, tetanus, and pertussis; IPV for polio; MMR for measles, mumps, and rubella; and VAR for varicella. Administering all four at this stage ensures the child has immunity to these diseases before starting school. It’s also common to give multiple vaccines in one visit if appropriate, since they are safe to co-administer. The other options miss one or more components, leaving gaps in protection—for example, omitting varicella or measles/mumps/rubella—so they don’t provide the full 4-6 year catch-up set.