a*****9
发帖数: 372 | 1 Masks were ineffective in preventing the spread of the coronavirus, small
study find
A small experiment involving patients with coronavirus who wore cotton and
surgical masks showed that both seemed ineffective in preventing the spread
of the coronavirus when the patients coughed. Scientists found coronavirus
particles in the environment and on the exterior of the mask itself.
The experiment was published Monday in the Annals of Internal Medicine.
Scientists tested face masks on four patients infected with the coronavirus
at two hospitals in Seoul, South Korea.
They compared the use of surgical masks with reusable 100% cotton masks
against patients who were not wearing masks. The researchers placed a petri
dish about 7 inches from the patients’ mouths and told the patient to cough
five times each onto a petri dish.
Researchers saw greater contamination on the outer surface of the mask,
compared to the inner surface. It was unclear if the force of the person’s
cough leaked out of the edge of the mask to contaminate the outer surface,
or if the particles of the coronavirus were so small that a high-velocity
cough penetrated the mask.
The experiment did not look at the effectiveness of N95 masks, nor did it
show if the masks protected against the actual transmission of infection
from patients with Covid-19 while wearing different masks. Nor does it show
if masks shorten the distance these droplets travel while someone is
coughing.
More research will be needed to determine if the masks help prevent the
spread of the disease with people who are asymptomatic or people who have
Covid-19 and aren’t coughing. |
f********g
发帖数: 32 | |
x******g
发帖数: 33885 | 3 嗯，轮子千万别戴
spread
coronavirus
【在 a*****9 的大作中提到】
: Masks were ineffective in preventing the spread of the coronavirus, small
: study find
: A small experiment involving patients with coronavirus who wore cotton and
: surgical masks showed that both seemed ineffective in preventing the spread
: of the coronavirus when the patients coughed. Scientists found coronavirus
: particles in the environment and on the exterior of the mask itself.
: The experiment was published Monday in the Annals of Internal Medicine.
: Scientists tested face masks on four patients infected with the coronavirus
: at two hospitals in Seoul, South Korea.
: They compared the use of surgical masks with reusable 100% cotton masks
|
a***n
发帖数: 1993 | 4 那台湾怎么老强调要戴口罩
spread
coronavirus
【在 a*****9 的大作中提到】
: Masks were ineffective in preventing the spread of the coronavirus, small
: study find
: A small experiment involving patients with coronavirus who wore cotton and
: surgical masks showed that both seemed ineffective in preventing the spread
: of the coronavirus when the patients coughed. Scientists found coronavirus
: particles in the environment and on the exterior of the mask itself.
: The experiment was published Monday in the Annals of Internal Medicine.
: Scientists tested face masks on four patients infected with the coronavirus
: at two hospitals in Seoul, South Korea.
: They compared the use of surgical masks with reusable 100% cotton masks
|
a*****9
发帖数: 372 | 5 你今天怎么这么悲愤？
【在 f********g 的大作中提到】
: 你别戴，你戴你就是孙子
|
s*****1
发帖数: 1 | 6 徒儿加加 cdc都改口称要戴口罩了
你咋还执迷不悟 |
f********g
发帖数: 32 | 7 CDC 都改口了，你还忽悠。
【在 a*****9 的大作中提到】
: 你今天怎么这么悲愤？
|
a*****9
发帖数: 372 | 8 CDC的指南是有条件的
只有你在不能维持social distance 的时候可以带
【在 f********g 的大作中提到】
: CDC 都改口了，你还忽悠。
|
a*****9
发帖数: 372 | 9 小徒孙啊
CDC的指南是有条件的
只有你在不能维持social distance 的时候可以带
【在 s*****1 的大作中提到】
: 徒儿加加 cdc都改口称要戴口罩了
: 你咋还执迷不悟
|
c****h
发帖数: 4968 | 10 Ineffective并不是"无效"。哪怕能让感染率下降5%，也是有效的。 |
a*****9
发帖数: 372 | 11 这个硏究并没有证实能让感情染率下降5%
【在 c****h 的大作中提到】
: Ineffective并不是"无效"。哪怕能让感染率下降5%，也是有效的。
|
s*****1
发帖数: 1 | 12 徒儿你这是自己打脸，在不能维持soical distancing的情况要求带，说明了戴口罩有效
: 小徒孙啊
: CDC的指南是有条件的
: 只有你在不能维持social distance 的时候可以带
【在 a*****9 的大作中提到】
: 这个硏究并没有证实能让感情染率下降5%
|
b**l
发帖数: 33123 | 13 你戴了？
【在 a*****9 的大作中提到】
: 你今天怎么这么悲愤？
|
s********i
发帖数: 17328 | 14 这个实验难到不应该看盘子上有多少吗？口罩上越多（不管里面还是外面），盘子上就
越少啊？
spread
★ 发自iPhone App: ChinaWeb 1.1.5
【在 a*****9 的大作中提到】
: Masks were ineffective in preventing the spread of the coronavirus, small
: study find
: A small experiment involving patients with coronavirus who wore cotton and
: surgical masks showed that both seemed ineffective in preventing the spread
: of the coronavirus when the patients coughed. Scientists found coronavirus
: particles in the environment and on the exterior of the mask itself.
: The experiment was published Monday in the Annals of Internal Medicine.
: Scientists tested face masks on four patients infected with the coronavirus
: at two hospitals in Seoul, South Korea.
: They compared the use of surgical masks with reusable 100% cotton masks
|
