From the immunization history, which vaccine is scheduled at 20 months but not at 5 years?

From the immunization history, which vaccine is scheduled at 20 months but not at 5 years?

• A. DTP, Hib, and OPV
• B. DTP, Hib, and MMR
• C. DTP, Hib, and Hep B
• D. DTP, Hib, and Var

Answer: (D)

Understanding vaccine timing helps you see which vaccines are finished by the 20‑month visit and which ones get boosters later. Hib is typically given in infancy and its primary series is completed by about 12–15 months (with a possible boost around 18 months in some schedules). By the time a child reaches age 5, Hib boosters are not routinely given in many schedules, so Hib does not appear as a continuing requirement at that age. The other vaccines listed (DTP and Varicella) often have additional doses or boosters scheduled around 4–6 years in many guidelines, so they aren’t as clearly “scheduled at 20 months but not at 5 years” as Hib is in this context. Therefore, the combination that emphasizes Hib as the vaccine that fits the pattern of being given by 20 months but not continued at 5 years aligns with this relationship, while still noting that schedules can vary by country and year.

Understanding vaccine timing helps you see which vaccines are finished by the 20‑month visit and which ones get boosters later. Hib is typically given in infancy and its primary series is completed by about 12–15 months (with a possible boost around 18 months in some schedules). By the time a child reaches age 5, Hib boosters are not routinely given in many schedules, so Hib does not appear as a continuing requirement at that age. The other vaccines listed (DTP and Varicella) often have additional doses or boosters scheduled around 4–6 years in many guidelines, so they aren’t as clearly “scheduled at 20 months but not at 5 years” as Hib is in this context. Therefore, the combination that emphasizes Hib as the vaccine that fits the pattern of being given by 20 months but not continued at 5 years aligns with this relationship, while still noting that schedules can vary by country and year.