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Wearing
Two-Layer Masks Is Better For Epidemic Prevention ?
The
US Centers For Disease Control and
Prevention believes that masks must fit the face in order to exert
maximum protection. They provide 8 ways to wear masks
correctly for the best virus prevention.
The
Delta variant virus has invaded the world. The latest anti-epidemic
practice in the United States: "wear two layers of masks."
How
to wear a mask more correctly? Why do I need to wear two layers of
masks? Is it practically feasible? We have compiled Q&As
from the US CDC report to clear your doubts.
Q: Is it dangerous to stay in the
same space with strangers (such as going to a hypermarket or taking
the public transportation)?
A: Correct.
In
a poorly ventilated room, the risk of infection is increased regardless
of the distance.
According
to a
report by the US Centers for Disease Control and
Prevention on May 7, the Corona Virus is mainly transmitted
through three methods: droplets, aerosols, and indirect contact.
When
people exhale, they will spray droplets of different sizes; the largest
droplets will quickly diffuse into the air within a few seconds to a
few minutes; when these droplets are dried, small droplets and aerosols
will form, so small that they can stay in the
air from several minutes to several hours. The risk of
infection is highest when the distance from the infected person is 90
to 180 cm or 35 inches to 70 inches.
Therefore,
many people think that keeping a safe distance can prevent infection;
in fact, cases of infection still occurs from more than 180 cm
away.
Examples
include: the infected person exhales the virus indoors for more than 15
minutes or several hours, causing the virus concentration in the air to
be high enough to spread to people 180 cm away; in some
cases, when a person enters space that the infected
person previously stayed and left
may also become infected.
In
the above situation, there are three other factors that increase the
chance of infection:
・A
closed space with poor ventilation or air conditioning can cause the
exhaled water vapor to gather and accumulate in the space, especially
small saliva or mist.
・Increase exhaled
air, such as when the infected person exerts force or raises their
voice, such as exercising, yelling or singing.
・Exposed
to the above environment for more than 15 minutes.
As
a rule of thumb, attending a BBQ party, going to the gym is a
dangerous move.
Q: Wearing two layers of masks (one layer of
cloth, one layer of surgical mask), is it really better to prevent the
epidemic?
A: Correct. But it is difficult to do in hot
climates and summers.
This
report proposes two ways to wear a mask to ensure that the mask fits
tightly on the face, which can increase the protective effect by 90% in
practice (even 95% in the laboratory):
First,
wear a cloth mask on top of a medical mask.
Secondly,
after folding the medical mask in half, tie the ear straps close to the
mask, stuff the excess fabric into the mouth cover, and flatten it on
the face. (As shown on the following video)
https://www.youtube.com/watch?v=GzTAZDsNBe0
The
report also pointed out that the use of a mask fitter or a nylon cover
similar to mountain-clumbing nylon jack on a mask, combined
with other protective measures, such as keeping distance, avoiding
crowds, avoiding poorly ventilated indoor environments, and washing
hands frequently. This is te most effective way to reduce the spread of
new Corona virus.
The
US Centers for Disease Control and Preventiont of Disease
Control and Prevention-How to Wear Masks-Corona
Virus -Epidemic Prevention, Image source: U.S. Department of
Disease Control
In
April of this year, the US Centers for Disease Control and
Preventiont released the
technique of wearing masks again, emphasizing that masks must
be fit and must be multi-layer masks (such as medical masks) that can
block droplets in order to be most effective.
How
to make the mask fit the face better ? There are six
approaches:
The Six DOS to wear masks that better
fit your face:
DO choose a mask with a wire on
the bridge of the nose. Remember to bend the wire to make the mask
close to the bridge of the nose.
DO use a mask fitter to prevent
air from escaping from the edge of the mask
DO keep the mask close to the
mouth, nose, and chin, and make sure that air does not flow out of the
eyes or the side of the mask. If the mask is tight enough, you will
feel warm air coming out of the front of the mask when you breathe, and
you will also see the mask fluctuate with your breathing.
DO add another layer of
protection outside the mask. If you wear a medical disposable mask
first, and then wear a cloth mask with multiple layers of material, the
cloth mask must be able to hold down the edge of the disposable
mask.
DO knot the ear straps near the
mask and stuff the excess part into the mouth cover.
Growing
the beard may make it more difficult for the mask to fit the face
shape. People with a beard can shave, trim their beard, or use a mask
holder, or wear a medical mask first and then a cloth mask.
The
United States U.S. Centers for Disease Control & Prevention -How to
wear masks-Masks-New crown pneumonia-Anti-epidemic masks ear straps are
knotted to make the mask more tightly fit on the face. Image source:
U.S. Centers for Disease Control & Prevention
Two DONTs wrong ways to wear
masks :
DO NOT wear two medical
masks. Medical masks are not designed to fit the face tightly, and it
is useless to wear two masks.
DO NOT wear another mask outside
the N95 mask, just wear it alone.
In
the hot summer time, wearing a mask when walking outdoors may be soaked
with sweat. Once the mask is wet, its protective power is greatly
reduced. ". Therefore, although the practice of "wearing two layers of
masks" has a good intention, it may not work in
summer time and can only be done indoors.
Learn
more about the correct way to wear a mask: how to wear a
mask? Download the U.S. Center for Disease Control and
Prevention Guidelines
Q: Is spraying disinfectant water on the
streets really just giving people peace of mind?
A: Correct.
According
to a report from the US CDC, the viability and infectivity of the
virus will be greatly reduced by environmental factors such as
temperature, humidity, and ultraviolet rays over
time.
It
is difficult for the virus to survive in places exposed to the sun
outdoors, and it does not need to be disinfected. Although the virus
will survive on the surface of the object for a period of time, it
mainly refers to indoor door handles, elevator buttons, escalator
handrails, etc. These are the places that need
disinfection most.
At
the time like this, it is better that you become more cautious when it
comes to self-protection againest the Delta variant. Keeping in
style for the benefits of yourself or people around you. USE
these Sanrio
Japan Reusable Cotton Mask in Hello Kitty My Melody Kuromi Pochacco design
as your outer layer mask.
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