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07/30 CNN: 光靠疫苗控制不了变种病毒变种
[版面:军事天地][首篇作者:Qiguoji] , 2021年07月30日08:11:32 ,396次阅读,1次回复
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Qiguoji
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发信人: Qiguoji (我是个清纯的猥琐男), 信区: Military
标  题: 07/30 CNN: 光靠疫苗控制不了变种病毒变种
发信站: BBS 未名空间站 (Fri Jul 30 08:11:32 2021, 美东)

Vaccination is not enough by itself to stop the spread of variants, study
finds

https://www.cnn.com/2021/07/30/health/vaccination-alone-variants-study/index
.html

(CNN)Vaccination alone won't stop the rise of new variants and in fact could
push the evolution of strains that evade their protection, researchers
warned Friday.
They said people need to wear masks and take other steps to prevent spread
until almost everyone in a population has been vaccinated.
Their findings, published in Nature Scientific Reports, support an unpopular
decision by the US Centers for Disease Control and Prevention to advise
even fully vaccinated people to start wearing masks again in areas of
sustained or high transmission.

"We found that a fast rate of vaccination decreases the probability of
emergence of a resistant strain," the team wrote.

CDC document warns Delta variant appears to spread as easily as chickenpox
and cause more severe infection
CDC document warns Delta variant appears to spread as easily as chickenpox
and cause more severe infection
"Counterintuitively, when a relaxation of non-pharmaceutical interventions
happened at a time when most individuals of the population have already been
vaccinated, the probability of emergence of a resistant strain was greatly
increased," they added.

"Our results suggest that policymakers and individuals should consider
maintaining non-pharmaceutical interventions and transmission-reducing
behaviors throughout the entire vaccination period."
"When most people are vaccinated, the vaccine-resistant strain has an
advantage over the original strain," Simon Rella of the Institute of Science
and Technology Austria, who worked on the study, told reporters.

"This means the vaccine resistant strain spreads through the population
faster at a time when most people are vaccinated."
But if so-called non pharmaceutical interventions are maintained -- such as
mask use and social distancing -- the virus is less likely to spread and
change. "There is a chance to remove the vaccine resistant mutations from
the population," Rella said.
The team used a mathematical model to predict these changes, but their
findings follow what is known about the epidemiology of viruses and what's
known as selective pressure -- the force that drives any organism to evolve.
Governors and local school boards reignite the mask mandate fight in wake of
CDC's newest guidance
Governors and local school boards reignite the mask mandate fight in wake of
CDC's newest guidance
The findings suggest that policymakers should resist the temptation to lift
restrictions to celebrate or reward vaccination efforts.
This is likely to be especially true with a more transmissible variant such
as the Delta variant, said Fyodor Kondrashov, also of the Institute of
Science and Technology Austria.
"Generally, the more people are infected, the more the chances for vaccine
resistance to emerge. So the more Delta is infectious, the more reason for
concern," Kondrashov told reporters.
"By having a situation where you vaccinate everybody, a vaccine-resistant
mutant actually gains a selective advantage."
On Tuesday, the US CDC altered its guidance on mask use. The CDC said
earlier this year that fully vaccinated people are very safe from infection
and can take off their masks in most situations.
Unvaccinated people are 'variant factories,' infectious diseases
expert says
Unvaccinated people are 'variant factories,' infectious diseases expert says
Now, it says even fully vaccinated people can sometimes catch the virus and
if they catch the Delta variant, they are just as likely to infect someone
else as an unvaccinated person would be. It advised everyone in areas of
high or sustained virus transmission to wear masks when around others.
Many GOP politicians have derided the new advice. On Thursday, Mississippi
Gov. Tate Reeves called it "foolish."
While the CDC was not thinking about the evolution of variants, Kondrashov
said people skeptical of maintaining vigilance should be.
"The individual who already vaccinated and putting on a mask should not
think this is pointless but should think that there is a vaccine resistant
strain running around," he said.
Get CNN Health's weekly newsletter

Sign up here to get The Results Are In with Dr. Sanjay Gupta every Tuesday
from the CNN Health team.

"By preventing spread of vaccine resistant strains, you are preventing
evolution of this virus," he added.
"We have two tools in our toolbox to do this. One is non pharmaceutical
interventions such as mask wearing and the whole shebang, and the second is
vaccines. From an evolutionary perspective, what is necessary to reduce this
(spread) is to vaccinate as many people as possible as fast as possible and
across the globe."
--
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lasa
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发信人: lasa (拉萨号), 信区: Military
标  题: Re: 07/30 CNN: 光靠疫苗控制不了变种病毒变种
发信站: BBS 未名空间站 (Fri Jul 30 08:20:24 2021, 美东)

卧槽
丫挺写作水平就是高
分明是打脸打到歪
结果吹成中央永远伟大光荣正确:

Their findings, published in Nature Scientific Reports, support an unpopular
decision by the US Centers for Disease Control and Prevention to advise
even fully vaccinated people to start wearing masks again in areas of
sustained or high transmission.

--
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