Does Wearing Two Masks Provide More Protection?
From VOA Learning English, this is the Health & Lifestyle report.
Throughout the coronavirus health crisis, health officials across the world have been advising people to take important precautions to protect themselves.
We have been asked to wash our hands often and correctly. We have also been urged to stay socially distant from people outside our own household. And one of the most important precautions, of course, is to wear a face mask.
But as the pandemic continues, some people are now asking: Can wearing two masks provide more protection against the virus? The quick answer is: it depends.
Some health experts say it is possible that doubling up the masks could help in some situations.
One of those experts is Dr. David Hamer. He is an infectious disease expert at Boston University. Wearing just one mask should be enough for most situations, Hamer told The Associated Press. But the mask needs to fit well, he adds, and not be loose.
The U.S. Centers for Disease Control and Prevention (CDC) recommends wearing a cloth mask made from two or more layers. The mask, the health agency adds, needs to cover both the nose and mouth. And it should fit snugly on the face.
But even with the best fitting mask, some people might want extra protection in some situations. For example, people who are at risk for severe illness if infected with the coronavirus may want to wear two masks. People also may want to double up if they plan to be around others for long periods of time indoors or must be in an enclosed area, such as on an airplane.
In high-risk situations, another expert suggests wearing a cloth mask as well as a surgical mask. Dr. Monica Gandhi is an infectious disease expert at the University of California, San Francisco.
She says wearing both a cloth and surgical mask -- with either mask on top -- could offer increased protection against the coronavirus. Wearing the two masks that way, Gandhi adds, could have a similar effect as wearing an N95 mask.
N95 masks are a kind of personal protection equipment designed for health care workers and medical first responders. The CDC does not suggest that the general public wear N95 masks.
Gandhi also advises the use of added protection for people who will be indoors in areas where infection rates are high.
She offers another suggestion for situations where a person wants to receive the highest level of protection possible: A two-layer cloth mask that has a filter material in between.
For people wearing single cloth masks for everyday use, Gandhi has one important piece of advice -- make sure the cloth is made from strongly woven material. She says the mask should also have at least two layers. The layers and tight weave make it harder for virus-carrying particles to pass through the material.
And that's the Health & Lifestyle report.
I'm Anna Matteo.
He asked to be put under police protection.
Davina was sorting out scraps of material.
Gas storage is a high-risk places, security management is particularly important.
Cholera is a bacterial infection.
5.The layers and tight weave make it harder for virus-carrying particles to pass through the material.
pass through 通过
I bored a hole so that the bolt would pass through.
An estimated 1,600 vessels pass through the strait annually.
6.In high-risk situations, another expert suggests wearing a cloth mask as well as a surgical mask.
as well as 也
He's got plenty of brains as well as brawn.
He plays classical music, as well as pop and jazz.
我们被要求经常用正确的方法洗手。我们还被敦促要与家人以外的人保持社交距离 。当然，最重要的预防措施之一就是戴口罩 。
其中一位专家是大卫·哈默（David Hamer）博士。他是波士顿大学的传染病专家 。哈默告诉美联社，在大多数情况下，戴一个口罩就足够了 。但他补充说，口罩必须贴合面部，不能太松 。
美国疾病控制和预防中心(CDC)建议佩戴两层或两层以上的布料口罩。该卫生机构补充说，这种口罩需要遮住口鼻 。而且应该贴合面部 。
但即使戴上了最贴合的口罩，部分人在某些情况下也可能需要额外的防护。例如，如果感染了新冠病毒，有严重疾病风险的人可能得戴两只口罩 。如果人们计划长时间和他人呆在室内或必须呆在封闭区域（如飞机上），他们也可能也需要多戴几只口罩 。
在高风险的情况下，另一位专家建议除了佩戴布料口罩外，还要佩戴医用口罩。莫尼卡·甘地（Monica Gandhi）博士是加州大学旧金山分校的传染病专家 。
对于那些在日常生活中佩戴单一布料口罩的人，甘地有一条重要的建议——确保口罩是否用坚固的编织材料制成的。她说，这种口罩也应该至少有两层 。这种层状结构和紧密的编织使得携带病毒的颗粒很难穿透这种材料 。