Previously public data has alreadydisappeared from the Centers for Disease Control and Prevention's website after the Trump administration quietly shifted control of the information to the Department of Health and Human Services.

Since the pandemic began, the CDC regularly published data on availability of hospital beds and intensive care units across the country. But Ryan Panchadsaram, who helps run a data-tracking site called Covid Exit Strategy, said that when he tried to collect the data from the CDC on Tuesday, it had disappeared.

"We were surprised because the modules that we normally go to were empty. The data wasn't available and not there," he said. "There was no warning."

CDC Director Dr. Robert Redfield told reporters on a conference call Wednesday that stateswere told to stop sending hospital information to the National Healthcare Safety Network site, the CDC's system for gathering data, beginning Wednesday. Instead, all data will now be reported through HHS' reporting portal, officials said, adding that the decision was made to streamline data reporting and to provide HHS officials with real-time data.

Public health specialists and former health officials acknowledged that the CDC's data reporting infrastructure was limited, and said it needs to be overhauled to meet the demands of the Covid-19 pandemic. However, they expressed concern in interviews with CNBC that the change could lead to less transparent data.

When reached for comment Thursday by CNBC, HHS spokesman Michael Caputo said in a statement that the CDC was directed to make the data available again. In the future, he said, HHS will provide "more powerful insights."

"Yes, HHS is committed to being transparent with the American public about the information it is collecting on the coronavirus," he said. "Therefore, HHS has directed CDC to re-establish the coronavirus dashboards it withdrew from the public on Wednesday."

Representatives of the CDC did not immediately respond to CNBC's request for comment.Later in the day, the CDC restored the site's previousdashboards with data through Tuesday, saying: "This file will not be updated after July 14, 2020 and includes data from April 1 to July 14."

TheCDC's web pagefor data on available hospital and ICU beds has added a note that reads: "Data displayed on this page was submitted directly to CDC's National Healthcare Safety Network (NHSN) and does not include data submitted to other entities contracted by or within the federal government."

"We don't have this critical indicator anymore,"Panchadsaram said. "The intent of just switching the data streams towards HHS, that's fine. But you got to keep the data that you're sharing publicly still available and up to date."

Panchadsaram said he and his team, which includes researchers from theDuke-Margolis Center for Health Policy and from Resolve to Save Lives, a public health initiative led by former CDC director Dr. Tom Frieden, have been tracking the data since April.

Panchadsaram thinks of the project as something of a "progress bar" as they grade different states on the overall progress they've made in fighting Covid-19. Available hospital beds and ICU capacity is a key indicator they use to assess state performance, he added.

"It's disappointing. It happened a lot quicker than expected," he said. "The picture that we're presenting to the world is incomplete."

Other coronavirus researchers and public health specialists expressed concern because the policy change was announced so suddenly in the midst of a public health crisis that appears to be worsening.

Dr.Jennifer Nuzzo, an epidemiologist at Johns Hopkins University, which runs one of the most popular third-party coronavirus data dashboards, said the policy change won't impact the Hopkins site because they've managed to source their data directly from states.She added, however, that the policy change raises questions about the transparency of the data and the role of the CDC in the ongoing U.S. response.

"What worries me is that we seem to be pushing rather suddenly in the midst of what feels like a very urgent time in terms of surging cases that we're seeing across the country," she told CNBC. "The question is, what are we going to lose in this transition, and in particular at a moment where we really don't want to lose any ability to understand what's happening in hospitals."

Nuzzo expressed concern that the administration didn't appear to fully plan out how the transition in data reporting would work and didn't give hospitals or researchers a warning about the change or how it might affect them.

"I think it's reasonable to worry that it could lead to erosion of capacities at a moment where we very much can't afford to lose any abilities at this point," she added. "I don't fully understand how it's going to work. That in and of itself is problematic."

Dr. Jen Kates, senior vice president and director of global health and HIV policy at the Kaiser Family Foundation, echoed Nuzzo's concerns about the speed with which the decision has become policy. She added that the Trump administration has politicized the public health crisis for months, so the policy change raises concerns about the integrity of the data as well.

"It's been such a critical source of information for everyone, for states, for researchers, for reporters, for the public to try to understand what's happening," she said. "The last thing you want is for data to be politicized. It just raises that concern. Will data being at HHS create a more politicized use of it, or maybe not. But again, it's a concern that's been raised."

PresidentDonald Trumpand his administration have come under fire during the pandemic from critics who say the White House is undermining the country's public health professionals. Last week, Trump criticized the CDC's guidelines on reopening schools as too tough and expensive, and Vice President Mike Pence said the agency would issue additional recommendations.

"There's been concerns raised about when CDC has the leeway to offer its advice as a public health agency, really based on the evidence and the data, and there's been several examples where we're not clear that that's been the case," Kates said. "I think that is a concern that many have; is there any political significance to this change?"

More here:

Coronavirus data has already disappeared after Trump administration shifted control from CDC - CNBC