世界卫生组织（World Health Organization）近日就新型冠状病毒感染肺炎疫情发布最新问答，其中就如何正确佩戴口罩发布了专家意见。
世卫组织指出，佩戴口罩可以帮助预防某些呼吸系统疾病的传播，但在有些情况下佩戴口罩也容易使人产生某种“虚假的安全感”，导致人们可能忽略其他同等重要的基本防护措施。
世卫组织同时提醒说，必须确保口罩的正确使用和处置，以保证其有效并避免因不正确使用和处置口罩而增加病毒传播风险。
戴口罩究竟能否预防新冠病毒感染？
正确佩戴与丢弃口罩的方式是什么？
WHO专家现场教学演示如何佩戴口罩，并着重强调：口罩并非万能，需与手部清洁等预防措施配合落实！
不过，WHO称健康人士不必戴口罩，这似乎更适用于疫情并不严重的其他国家。
对于像中国这样人口众多的疫情感染区而言，人们往往很难在公众场合辨识出感染疫情者，而无症状感染者本身或许也并不知情。因此，健康人士戴口罩做好防备似乎无可厚非。
佩戴口罩能否预防新冠病毒感染？
Medical masks like this one cannot protect against the new Coronavirus when used alone. When you wear them, you must combine with hand hygiene and other preventive measures. WHO only recommends the use of masks in specific cases.
仅佩戴此类口罩并不足以预防新冠病毒感染。佩戴口罩之余，还须配合包括手部清洁等其他疫情防护控制措施。世卫组织建议，须在特定情况下佩戴口罩。
If you have cough, fever and difficulty breathing, you should wear a mask and seek medical care. If you do not have these symptoms, you do not have to wear masks, because there is no evidence that they protect people who are not sick. However, if you are healthy but you are taking care of a person who may be infected with the new Coronavirus, then you should wear a mask whenever you are in the same room with that person.
凡发烧、咳嗽、或呼吸困难者，应佩戴医用口罩，并寻求医助。若无以上这些病征，可不用佩戴医用口罩。无现时证据显示口罩有助于保护健康人士。但如果你是需要照顾疑似患者的健康人士，每当与疑似病例同处一室时，都需要佩戴口罩。
And remember, if you choose to wear a mask, use it and discard it properly and clean your hands with alcohol, hand rub or soap and water.
请记住，若选择佩戴口罩，须确保口罩的正确使用和丢弃，且用酒精、洗手液或肥皂与清水洗手。
What is the correct way to wear and dispose of masks?
正确佩戴与丢弃口罩的方式是什么？
If you decide to wear a medical mask, which is pleated and flat like this one, it is important to wear and discard it correctly. Otherwise, instead of protecting you, the mask becomes a source of infection because of the germs that may stay on it.
若选择佩戴医用口罩，即此类有褶皱的平面口罩，如何正确使用和丢弃十分重要。口罩误用，非但无法保护自己，反而会增加病毒传播风险，因为病菌可能会黏附于口罩上。
To wear it correctly, you should locate the metal strip at the top of the mask, place over your nose bridge, secure the elastics around your ears, or tie the strings behild your head. Make sure it covers your nose, mouth and chin.
正确佩戴口罩，首先要确认金属条的那端位于口罩上方，按压使其紧贴鼻梁，用绑带套住耳朵，或将两条线绳在脑后系紧，要确保口罩完全覆盖鼻子、嘴巴和下巴。
While in use, do not touch the front of your mask. To remove the mask, take the elastics from around your ears, or untie the strings behind your head. Do not touch the front of the mask as it may be contaminated.
佩戴口罩时，要避免用手触碰外罩污染面。取下口罩时，摘除挂耳绳或解绑脑后的系绳，不可用手触碰口罩外侧，因口罩外部可能已沾染病菌。
Remove the mask and discard in a closed bin. Cleanse your hands with alcohol, hand rub or soap and water. Hand hygiene should be done if you accidentally touch the front of your mask while wearing it.
取下口罩后，应立即丢弃在带盖的垃圾箱中，并用酒精、洗手液或肥皂与清水洗手。佩戴口罩时，若不小心触碰了口罩面，须立即清洁手部。
If your mask becomes damp or humid, replace it with a new dry mask. Never reuse single use masks and discard them immediately into closed bins after each use.