At minimum 1 exterior pro said the tactic could present basic safety challenges. Paul Knoepfler, a stem cell researcher at the College of California, Davis, said that patients with coronavirus can acquire critical reactions where by their immune devices go way too significantly in attacking cells in their lungs, producing harming swelling. Other cell therapies analyzed in China are developed to dampen the immune response. He stated one danger with the purely natural killer cells is they could go in the other route, exacerbating respiratory problems “by huge killing of the patients’ respiratory cells.”

In spite of the scant proof, Mr. Giuliani has turn out to be an early booster, interviewing Dr. Hariri on a podcast released on his web page Saturday, and praising the cure on Twitter, declaring, “this remedy has real opportunity.” In a tweet on Saturday, he added, “Let’s hope F.D.A. can identify that their cumbersome procedure designed to hold us safer, if it is not altered considerably in instances of fantastic need, can end result in unimaginable decline of human life.”

About the same time, Twitter deleted a article by Mr. Giuliani that it stated violated its principles. The tweet, from March 27, manufactured unfounded statements about the malaria drug hydroxychloroquine, one of the treatment plans that Mr. Trump has supported.

Dr. Hariri said that he has identified Mr. Giuliani for decades and that the look on his podcast was “a welcoming chat in between men and women who know every single other and who share a prevalent curiosity in this specific reaction to this disorder.”

He stated that he has no organization relationship with Mr. Giuliani, and that Mr. Giuliani is not symbolizing him in any way, possibly compensated or unpaid. “I really do not have nearly anything to do with what the mayor tweets or whatnot, and I never agree or disagree with everything,” he explained.

Dr. Hariri mentioned the enterprise would adhere to the proven process for tests no matter whether a drug performs. “We have waited for the F.D.A. to full their review, which they did in a heroic and speedy vogue,” he said.

On Wednesday night — the exact day the F.D.A. accepted his demo — Dr. Hariri praised the visual appeal by the agency’s commissioner, Dr. Stephen Hahn, on the conservative Fox News talk present “The Ingraham Angle.” “We are fortunate to have Dr. Hahn at the helm,” he tweeted.

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