護理師指導家長關於 MMR 疫苗的接種時程。標準建議為何？
A nurse is teaching a parent about the schedule for the MMR vaccine. What is the standard recommendation?
- AOnly if the child attends preschool僅在兒童就讀學前班時接種
- BThree doses at 6 months, 12 months, and 18 months在 6 個月、12 個月和 18 個月時接種三劑
- CTwo doses: 12-15 months and 4-6 years✓ 正解兩劑：12-15 個月和 4-6 歲
- DSingle dose at birth出生時接種單劑
MMR 疫苗（麻疹、腮腺炎、德國麻疹混合疫苗）屬於活性減毒疫苗，為了達到最佳的群體免疫效果並補足第一劑可能未產生足夠抗體者，標準接種計畫採取兩劑式給予。第一劑在兒童免疫系統發育至足以產生穩定反應的 12-15 個月時施打，第二劑則配合學齡前（4-6 歲）強化免疫力，這是確保社區安全與預防疾病爆發的關鍵。
The MMR vaccine (measles, mumps, and rubella combined vaccine) is a live attenuated vaccine. To achieve optimal herd immunity and to cover those who may not have developed adequate antibodies after the first dose, the standard immunization schedule consists of two doses. The first dose is given at 12 to 15 months, when the child's immune system is developed enough to produce a stable response, and the second dose is given before school age (4 to 6 years) to boost immunity, which is key to ensuring community safety and preventing disease outbreaks.