On July 29, Anthony Fauci sat before a Senate committee under subpoena and declined to answer questions more than one hundred times. In some two hundred and fifty prior appearances before Congress he had never once invoked the Fifth Amendment. He invoked it on the question of where the worst pandemic in a century began, and on all other questions.

He was entitled to do so. The Fifth is a right, and anyone who treats silence as proof of guilt misunderstands the Constitution. But this misses the larger point. Fauci directed the National Institute of Allergy and Infectious Diseases for thirty-eight years, becoming the face of the US medical science establishment (once referring to himself as such: “I am The Science”) and it was his agency among others that funded coronavirus research in Wuhan and in North Carolina. When the question is: How did a million Americans die? then the man who played the role of “America’s Doctor” does not get to stay silent and retain the mantle of science.

Four years ago, in the Proceedings of the National Academy of Sciences, we called for an independent inquiry into the origins of SARS-CoV-2, the virus that caused the pandemic, with full access to American as well as relevant Chinese records. The public was told from the very start of the pandemic that the origin issue was settled, that the virus was natural. But the issue most certainly was not settled, and every FOIA release, every whistleblower account, every Congressional document produced since 2022 has cast more doubt on this narrative and pointed instead toward a laboratory origin of the virus.

What Fauci should have said on July 29: "Here are my records. Here are NIH records. Compel the rest, and I will help you get the answer."

In January 2025 the Central Intelligence Agency finally aligned with that judgment, assessing "with low confidence that a research-related origin of the COVID-19 pandemic is more likely than a natural origin." The FBI reached the same conclusion with moderate confidence. So did the Department of Energy, which runs the national laboratories. Three American agencies and the German BND now favor a research-related origin. Yet that judgement has still not been evaluated in the light of all of the relevant American records bearing on the issue.

Dr. Deborah Birx, White House coronavirus response coordinator, and National Institute for Allergy and Infectious Diseases Director Dr. Anthony Fauci listen as President Donald J. Trump speaks with the coronavirus task force during a briefing in response to the COVID-19 coronavirus pandemic on Friday, March 20, 2020 in Washington, DC. (Photo by Jabin Botsford/The Washington Post via Getty Images)

We do, however, now know clearly how such a virus may have been made, because the recipe was written down. In 2018 Ralph Baric of the University of North Carolina, Peter Daszak of EcoHealth Alliance and Shi Zhengli of the Wuhan Institute of Virology submitted a proposal to DARPA called DEFUSE. It set out a specific plan: use Baric's reverse-genetics platform—the technology he built and patented for assembling coronaviruses from synthetic fragments—to construct bat sarbecovirus backbones, including consensus sequences assembled from field samples, and then insert a protease site at the S1/S2 junction of the Spike protein.

A protease site is essential in order for these bat viruses to jump the “species barrier” between bats and humans, and in this case is called a furin cleavage site (FCS). When it first appeared, SARS-CoV-2 was the only known virus of its family (the clade of Sarbecoviruses) to carry such a site. It remains unique in this respect. Despite much sampling of viruses from the bats that serve as the reservoir species for these viruses, no other virus in this clade or family has appeared that displays the FCS, just as no animal has been found in China that was infected with a progenitor of SARS-CoV-2. These findings continue to cause great concern.

This novel FCS was the feature that most alarmed the virologists who first read the genome as it represents an evolutionary leap with no evidence that this had taken place in nature. Unknown to most, American scientists had proposed to build exactly this feature into precisely that kind of coronavirus, only two years before the outbreak of a novel coronaviral disease in Wuhan. Given the availability of a suitable template virus, the insertion of twelve nucleotides to form the FCS would be trivial and similar work had already been performed.

Our charge is not that there was American involvement in the appearance of this virus. Our charge is that Fauci and other US officials and scientists have blocked the search for the truth.

Now consider what was said behind closed doors. On January 31, 2020, leading virologists told Fauci that the genome looked engineered. Jeremy Farrar of the Wellcome Trust convened them the next day, and the day after sent Fauci and Francis Collins a tally of where they stood. Michael Farzan, who discovered the receptor used by SARS -CoV 1 and 2 to enter human cells, put the odds at sixty-forty or seventy-thirty for........

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