下列哪些活動被視為初級預防？（選所有適合的）
Which of the following activities are considered primary prevention? (Select all that apply.)
- AHealth education classes on nutrition✓ 正解關於營養的健康教育課程
- BRegular screening mammograms定期乳房攝影篩檢
- CChildhood vaccination programs✓ 正解兒童疫苗接種計畫
- DSafety belt and helmet laws✓ 正解安全帶與安全帽法規
- ERehabilitation after a heart attack心肌梗塞後的復健
初級預防聚焦於阻斷疾病發生的源頭。健康教育（營養）、疫苗接種及安全法規（如安全帶）皆在疾病發生前提供保護或提升防禦力，符合初級預防定義。次級預防則涉及篩檢（如乳房攝影），旨在早期診斷。三級預防則是在疾病已發生後，目標為減輕併發症與復健。在 NCLEX 考試中，必須嚴格區分這三者的機轉，以確保正確分類護理活動。
Primary prevention focuses on blocking the origins of disease. Health education (nutrition), vaccination, and safety regulations (such as seat belts) all provide protection or enhance defenses before disease occurs, fitting the definition of primary prevention. Secondary prevention involves screening (such as mammography) and aims at early diagnosis. Tertiary prevention is implemented after the disease has occurred, aiming to reduce complications and provide rehabilitation. On the NCLEX, the mechanisms of these three levels must be strictly distinguished to correctly classify nursing activities.