下列哪項是醫療照護相關感染最常見的原因？
Which of these is the most common cause of healthcare-associated infections?
- AAir conditioning failure空調系統故障
- BUnsterile linen未無菌的床單
- CContaminated food受污染的食物
- DPoor hand hygiene✓ 正解手部衛生不良
醫療照護相關感染（Healthcare-Associated Infections, HAIs）是病人住院期間獲得的感染，手部衛生（Hand hygiene）被公認為預防傳播最有效、成本最低的措施。護理師的手部常攜帶暫時性菌叢（Transient flora），若未經適當洗手或使用乾洗手液，病原體會在醫療環境中迅速傳播。其他選項雖可能導致感染，但統計上手部衛生不佳是導致交叉感染的最主要原因。
Healthcare-Associated Infections (HAIs) are infections acquired during hospitalization. Hand hygiene is recognized as the single most effective and least costly measure for preventing transmission. The nurse's hands frequently carry transient flora, and without appropriate handwashing or alcohol-based hand rub, pathogens can spread rapidly within the healthcare environment. Although the other options can cause infection, poor hand hygiene is statistically the leading cause of cross-contamination.