護理師向社區教導疫苗接種，下列何者為每年流感疫苗接種的優先族群？
A nurse is teaching a community class about immunization. Which group is the priority for the annual flu vaccine?
- AOlder adults (65+)✓ 正解高齡長者（65歲以上）
- BTeenagers (13-18)青少年（13-18歲）
- CAdults with no chronic conditions無慢性病史之成人
- DHealthy 20-year-olds健康的20歲青年
流感疫苗接種的核心目標是保護高風險族群，以降低重症與死亡率。65 歲以上長者因免疫系統退化（Immunosenescence），感染流感後引發肺炎或其他併發症的風險遠高於一般健康成人。在資源分配上，優先保障高風險族群是公衛政策的核心原則。健康成人雖建議接種以建立群體免疫，但相較於長者，其臨床迫切性較低。
The core goal of influenza vaccination is to protect high-risk populations in order to reduce severe disease and mortality. Adults aged 65 and older, due to immunosenescence, face a far higher risk of pneumonia and other complications from influenza than healthy adults. In terms of resource allocation, prioritizing protection of high-risk groups is a core public health principle. Although healthy adults are also encouraged to receive the vaccine to build herd immunity, their clinical urgency is lower compared with older adults.