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By Tuesday, some Twitter accounts were testing the new boundaries and celebrating the platform's hands-off approach, which comes after Twitter was purchased by Elon Musk.

“This policy was used to silence people across the world who questioned the media narrative surrounding the virus and treatment options,” tweeted , a physician and leading purveyor of COVID-19 misinformation. “A win for free speech and medical freedom!”

Twitter's decision to no longer remove false claims about the safety of COVID-19 vaccines disappointed many , however, who said it could lead to more false claims about the virus, or the safety and effectiveness of vaccines.

“Bad news,” tweeted epidemiologist , who urged people not to flee Twitter but to stay and stand up for accurate information about the virus. “Stay folks — do NOT cede the town square to them!”

The virus, meanwhile, . ��ɫtvly, new COVID cases averaged nearly 38,800 a day as of Monday, according to data from Johns Hopkins University — far lower than last winter but a vast undercount because of reduced testing and reporting. About 28,100 people with COVID were hospitalized daily and about 313 died, according to the most recent federal daily averages.

Cases and deaths were up from two weeks earlier. Yet a fifth of the U.S. population hasn’t been vaccinated, most Americans haven’t gotten the latest boosters, and many have stopped wearing masks.

Musk, , has signaled an interest in rolling back many of the platform's previous rules meant to combat misinformation.

Last week, to account holders who had been . He's also reinstated the accounts for several people who spread COVID misinformation, including that of Rep. Marjorie Taylor Greene, this year for repeatedly violating Twitter's COVID rules.

Greene's most recent tweets include ones questioning the effectiveness of masks and making baseless claims about the safety of COVID vaccines.

Since the pandemic began, platforms like Twitter and Facebook have to a , its and the response to it.

Under the policy enacted in January 2020, Twitter prohibited false claims about COVID-19 that the platform determined could lead to real-world harms. More than 11,000 accounts were suspended for violating the rules, and nearly 100,000 pieces of content were removed from the platform, according to Twitter's latest numbers.

Despite its rules prohibiting COVID misinformation, Twitter has struggled with enforcement. Posts making bogus claims about home remedies or could still be found, and it was difficult on Tuesday to identify exactly how the platform's rules may have changed.

Messages left with San Francisco-based Twitter seeking more information about its policy on COVID-19 misinformation were not immediately returned Tuesday.

A search for common terms associated with COVID misinformation yielded lots of misleading content, but also automatic links to helpful resources about the virus as well as authoritative sources like the Centers for Disease Control and Prevention.

Dr. Ashish Jha, the , said Tuesday that the problem of COVID-19 misinformation is far larger than one platform, and that policies prohibiting COVID misinformation weren't the best solution anyway.

Speaking at a Knight Foundation forum Tuesday, Jha said misinformation about the virus spread for a number of reasons, including legitimate uncertainty about a deadly illness. Simply prohibiting certain kinds of content isn't going to help people find good information, or make them feel more confident about what they're hearing from their medical providers, he said.

“I think we all have a collective responsibility,” Jha said of combating misinformation about COVID. “The consequences of not getting this right — of spreading that misinformation — is literally tens of thousands of people dying unnecessarily.”