護理師教導新手媽媽關於疫苗知識，下列哪項正確？
A nurse is teaching a new mother about immunization. Which of the following is true regarding vaccines?
- AVaccines provide active immunity against specific pathogens✓ 正解疫苗提供對特定病原體的主動免疫
- BVaccines cause autism in healthy children疫苗會導致健康兒童自閉症
- CVaccines are not effective for viral diseases疫苗對病毒性疾病無效
- DVaccines are only necessary during the first year of life疫苗僅在生命第一年有必要施打
疫苗透過將減毒或滅活的抗原引入體內，刺激免疫系統產生抗體與免疫記憶，這就是「主動免疫」（Active immunity）。當未來再次接觸到該病原體時，免疫系統能迅速識別並攻擊，從而預防疾病。其他選項皆不正確：疫苗接種期程應涵蓋終生，而非僅在嬰兒期；疫苗與自閉症無關；疫苗是預防病毒性疾病最成功的工具之一。
Vaccines introduce attenuated or inactivated antigens into the body to stimulate the immune system to produce antibodies and immune memory, which is termed 'active immunity.' When the same pathogen is encountered again in the future, the immune system can quickly recognize and attack it, thereby preventing disease. The other options are incorrect: vaccination schedules should cover the entire lifespan rather than only infancy; vaccines are not associated with autism; vaccines are one of the most successful tools for preventing viral disease.