什么是手部卫生？为什么要经常洗手？内容如下：

您好，这是金品问答。手部卫生是指保持手部清洁，以防止病原体（如细菌、病毒或真菌）的传播。经常洗手是预防感染和疾病的最简单、最有效的方法之一。洗手可以减少感染冠状病毒、流感、肠胃炎等常见疾病的风险。洗手时，应使用肥皂和清水，或者含酒精的洗手液，按照正确的步骤擦洗至少20秒。洗手的最佳时机是在接触公共物品、吃饭、咳嗽或打喷嚏、上厕所、处理伤口或照顾病人之前和之后。

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: [Hand hygiene - World Health Organization](https://www.who.int/health-topics/hand-hygiene#tab=tab_1)
: [Why is handwashing important? - NHS](https://www.nhs.uk/live-well/healthy-body/best-way-to-wash-your-hands/)
: [Show Me the Science – Why Wash Your Hands? | Handwashing | CDC](https://www.cdc.gov/handwashing/why-handwashing.html)
: [How to wash your hands - NHS](https://www.nhs.uk/live-well/healthy-body/best-way-to-wash-your-hands/)
: [When and How to Wash Your Hands | Handwashing | CDC](https://www.cdc.gov/handwashing/when-how-handwashing.html)