这是一篇有关美国CDC建议缩短新冠阳性确诊美国人居家隔离的时间，从10天减少到5天。 6park.com
CDC主任的公开承认这个决定不是基于科学的研究和调查，而是基于CDC想美国人不愿意忍受10天的居家隔离。 而且还无耻的说新冠阳性确诊的人5天以后，传染性会低于最大传染能力。 回到工作单位没问题。  6park.com
原文链接：
https://www.yahoo.com/news/cdc-defends-covid-isolation-guidelines-141709471.html

‘This was the moment’: CDC defends altered guidance amid Omicron surge

Quint Forgey 6park.com
Wed, December 29, 2021, 6:17 AM 6park.com
CDC Director Rochelle Walensky on Wednesday sought to deflect several lines of skepticism about the agency’s 
newly shortened, five-day period of  recommended isolation for asymptomatic individuals who test positive for 
Covid-19.

The multi-part defense from Walensky — who appeared on at least five TV networks on Wednesday morning —
comes as the Biden administration has begun instituting new guidance and considering further restrictions to 
curb an explosion of U.S. coronavirus cases caused by the Omicron variant.

But the shifting instruction from federal health officials has prompted some criticism that the administration is 
prioritizing a return to economic normalcy over the safety of Americans who could still be infected by 
asymptomatic co-workers, even after those individuals self-quarantine for five days.

On Wednesday, Walensky acknowledged that the CDC’s decision to alter the recommended isolation period 
“really had a lot to do with what we thought people would be able to tolerate.”

“We have seen relatively low rates of isolation for all of this pandemic. Some science has demonstrated less than
 a third of people are isolating when they need to,” Walensky told CNN.

“And so we really want to make sure that we had guidance in this moment — where we were going to have a lot 
of disease — that could be adhered to, that people were willing to adhere to and that spoke specifically to when 
people were maximally infectious,” she continued.

Indeed, the U.S. on Tuesday logged its highest single-day total of new Covid-19 cases, with 441,278 infections 
surpassing the previous daily record by close to 150,000. The dire state of the pandemic across the country 
demanded a change in CDC’s “conservative” guidance, Walensky said on Wednesday.

“In the context of the fact that we were going to have so many more cases — many of those would be 
asymptomatic or mildly symptomatic — people would feel well enough to be at work, they would not necessarily 
tolerate being home, and that they may not comply with being home, this was the moment that we needed to 
make that decision,”  Walensky told CNN.

Last Thursday, the administration announced that health care workers who test positive for Covid-19 would be
 allowed to return to work after seven days, as opposed to the previously recommended 10 days, if they test 
negative and are asymptomatic after their isolation period.
Furthermore, the CDC advised that health care workers’ isolation period could be cutto five days, or even fewer, 
in the event of severe staffing shortages at U.S. hospitals.
Then, on Monday, the CDC announced that individuals who test positive for Covid-19 and are asymptomatic need 
to isolate for only five days, not 10 days, citing increasing evidence that people are most infectious in the initial 
days after developing symptoms.
The new CDC guidance, which is the same regardless of vaccination status, also recommends that individuals 
leaving isolation wear a mask for another five days following their self-quarantine.
“This was really a way to tell people: Make sure you isolate in those first five days, when you’re maximally infected,” Walensky told NBC on Wednesday.
Still, the new CDC guidance does not require individuals at the end of their isolation period to test negative 
for Covid-19 before reentering society — a point of contention for some public health experts who have 
criticized the agency‘s revised recommendation.
“It’s frankly reckless to proceed like this,” Eric Topol, founder and director of the Scripps Research Translational 
Institute, told The Associated Press on Tuesday. “Using a rapid test or some type of test to validate that the 
person isn’t infectious is vital.”
But Walensky on Wednesday said the CDC decided against requiring a negative test result as part of its new 
guidance because the agency is still unaware of how well Covid-19 rapid antigen tests “predict whether you’re 
transmissible during the end of disease.”
“If you got a rapid  test at five days and it was negative — we weren’t convinced that you weren’t still 
transmissible — we didn’t want to leave a false sense of  security. We still wanted you to wear the mask,” 
Walensky told CNN.
“And if it was positive — we still know the maximum amount of transmission was behind you — we still wanted 
you to wear a mask,” she added. “And given that we were not going to change our recommendations based on 
the result of that rapid test, we opted not to include it.”
As for the more accurate Covid-19 PCR tests — which use real-time polymerase chain reaction technology and 
generally take hours to produce results — Walensky said they were not included in the new CDC guidance 
because they can show positive results up to 12 weeks after initial infection.
“That is not going to be helpful,” Walensky told NBC. “You’re not going to be transmitting during all of that 
period of time.”
Although Walensky defended the CDC’s decision not to add a negative testing requirement to its new guidance, 
she still promoted the overall efficacy of antigen tests — which the FDA on Tuesday warned might be less 
capable of detecting the Omicron variant.
“We do know that the antigen test may not perform as well as it had for prior variants — the Alpha variant and 
the Delta variant — but it’s still picking up quite a bit of infection,” Walensky said.
Walensky went on to reiterate the CDC’s guidance that if an individual receives a negative result from an antigen
 test but experiences Covid-19 symptoms, they “should go ahead and get that PCR test” to better diagnose a 
potential infection.
Pressed on why the CDC’s guidance last Thursday for health care workers included a negative-testing 
requirement while its guidance on Monday for all Americans did not, Walensky told CNN that “infection control 
recommendations in the health care workplace are always more stringent for health care workers than they are 
for the general population.”
Walensky also denied that the absence of a negative-testing requirement in the CDC’s new guidance was related 
to a shortage of tests, telling CBS: “This really had nothing to do with supply.”
President Joe Biden pledged in a White House address on Dec. 21 that his administration would buy 500 million 
at-home rapid antigen tests that Americans will be able to order for free beginning in January. But details about
 the purchasing plan remain murky, and Arkansas Gov. Asa Hutchinson, chair of the National Governors 
Association, has warned it could interfere with state-level efforts already underway to boost testing supply.
 6park.com
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