Cities and states say they want to see data that led CDC to make a mask-U-turn before rules were changed

The Centers for Disease Control and Prevention are coming under mounting pressure to release the data that led them to roll back mask guidelines on Tuesday as cities and states say they need to see the evidence before revising their own policies. .

Federal officials say unpublished data showed that vaccinated people infected with COVID-19 could potentially transmit the virus, leading them to recommend that everyone should wear a mask indoors in high-transmission areas.

Republicans have questioned the new findings, and even Democrat-led cities say they won’t make changes without understanding the facts.

Iowa Governor Kim Reynolds said the change was confusing.

“I haven’t seen the data — they don’t really come out on a lot of data they’re using to make this change in guidance,” she said at a news conference.

“And I really haven’t seen any data that would support that states that don’t issue a mask mandate versus states that do issue a mask mandate — that the statistics are so much different.”

“This is not a decision CDC has taken lightly… this is something that weighs heavily on me and all of America,” said Rachelle Walensky, CDC director as she reversed the mask guidance.

After weeks of progress, Biden officials are battling a spate of cases fueled by the highly transmissible Delta strain of COVID-19 and vaccine hesitancy in some states

After weeks of progress, Biden officials are battling a spate of cases fueled by the highly transmissible Delta strain of COVID-19 and vaccine hesitancy in some states

Scientists have also asked for the data to be released.

“They claim that people with delta who have been vaccinated and unvaccinated have a similar viral load, but nobody knows what that means,” Dr. Gregg Gonsalves, an associate professor at the Yale School of Public Health, to The Washington Post.

When CDC director Dr. Rochelle Walensky announced the reverse policy on Tuesday, she said “new scientific data” justified the move. She said it came from research into “breakthrough” infections, comparing viral loads between vaccinated and unvaccinated people.

But the CDC has yet to provide more specific information about the studies.

That information vacuum has been filled by, for example, House Minority Leader Kevin McCarthy, who claimed a doctor told him that the study was conducted in India with a vaccine that was not approved in the US.

At the same time, democratically-run cities have said they cannot make changes without being fully aware of the facts.

At a news conference with Mayor Bill de Blasio, New York City Health and Hospitals president Mitchell Katz said, “Although the CDC issued their advisory at about 3 p.m. yesterday, they have not yet released their scientific reports on the data underlying to their recommendation. ‘

He added that his focus remained on vaccinating people.

“I think we owe it to the New Yorkers to, as you say, look at that information very carefully and understand its implications,” he said.

The day before, Anthony Fauci, the top infectious disease expert, told MSNBC that the latest information suggested that even vaccinated people can spread Delta and explains.

Previous research found that people infected with Delta have 1,000 times more copies of the coronavirus in their respiratory tract than people infected with older strains of the virus.

Vaccinated people can spread Delta just like unvaccinated people, says Dr Fauci

Vaccinated people can spread Delta just like unvaccinated people, says Dr Fauci

Since the start of the pandemic, a common measure used by scientists is ‘viral load’ – a measurement of how many copies of the coronavirus are in a patient’s body.

When patients have a higher viral load – more copies of the virus – they are more likely to pass the virus on to someone else.

As the coronavirus has mutated into new variants, the viral load has increased. Delta is therefore now the most contagious variant.

In fact, according to Fauci, Delta is so contagious that even vaccinated people can spread it.

‘We have a Delta variant that has changed the entire landscape,’ he says.

Nationally, the variant causes more than 80 percent of cases — and in some regions, it’s over 90 percent.

“If you look at the virus level in the nasopharynx of a vaccinated person who gets a breakthrough infection with Delta, it’s exactly the same as the virus level in an unvaccinated person who is infected,” Fauci said.

“That triggered the change in the CDC guideline,” referring to the agency’s recent backtrack on masking recommendations for vaccinated Americans.

In May, the CDC said anyone who completed a full vaccination regimen — two injections of Pfizer or Moderna, or one injection of Johnson & Johnson — could go anywhere without a mask.

But this week, the agency said several groups of fully vaccinated Americans should go back to masking in public, indoor spaces.

This includes people living in areas with rapidly rising Covid cases, teachers in K-12 schools, and parents with children who are too young to be vaccinated.

In announcing the change, CDC director Dr. Rochelle Walensky quoted “new scientific data” consistent with Dr. Fauci’s statement: Vaccinated people can spread Delta.

The statement also ties in with a recent study from China that suggests that people infected with Delta have a 1,000 times higher viral load than people infected with older strains of the coronavirus.

But the new data from the CDC is not yet public, raising concerns about the agency’s transparency.

People infected with the Delta strain had 1,000 times more copies of the virus in their respiratory tract than people infected with the original strain (above), a recent study found.

People infected with the Delta strain had 1,000 times more copies of the virus in their respiratory tract than people infected with the original strain (above), a recent study found.

A quote in the updated masking guidelines simply reads: ‘CDC COVID-19 Response Team, Unpublished Data, 2021.’

This data comes from studies of recent Delta-induced outbreaks, where researchers compared infections between vaccinated and unvaccinated people, according to the Washington Post.

The findings will be “published soon” per reporting from The Post.

But that’s not enough for some scientists — not even those who have endorsed the CDC’s new guidelines.

“They claim that people with delta who have been vaccinated and unvaccinated have a similar viral load, but nobody knows what that means,” Dr. Gregg Gonsalves, an associate professor at the Yale School of Public Health, told The Post.

“It’s pointless unless we see the data.”

Other experts are not convinced that a higher viral load actually leads to Delta transmission among vaccinated people.

“I feel like the nasal viral load is part of a lot of other parts” that determine how contagious a person is, biostatistician Natalie Dean told The Post.

Dean added that she thinks other important factors could be how much virus is present in a patient’s throat or lungs.

Experts like Dean want to see more data comparing the number of cases between vaccinated and unvaccinated Americans.

In recent months, the vast majority of severe Covid cases – leading to hospitalization and death – have occurred among the unvaccinated.

But the CDC doesn’t track less severe breakthrough infections. In May, the agency changed its strategy to investigate and report only those infections that cause hospitalization or death

Scientists have criticized this move before leaving the US without crucial data to track the cases caused by Delta and other variants.

Yet all Covid experts agree on one thing: Delta is of great concern and additional precautions are needed to stop its spread.

“Delta is alpha on steroids,” James M. Musser, chair of the Department of Pathology and Genomic Medicine at the Houston Methodist Hospital and Research Institute, told WaPo.

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