Members of the Wuhan Hygiene Emergency Response Team leave the closed Huanan seafood wholesale market in Wuhan city, Hubei province, Jan. 11, 2020. Investigations into the origin of COVID-19 have focused on animals sold at the market. Noel Celis/AFP/via Getty Images hide title toggle title Noel Celis/AFP/via Getty Images Sen. Rand Paul, R-Ky., clashed with
Members of the Wuhan Hygiene Emergency Response Team leave the closed Huanan seafood wholesale market in Wuhan city, Hubei province, Jan. 11, 2020. Investigations into the origin of COVID-19 have focused on animals sold at the market.
Noel Celis/AFP/via Getty Images
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Noel Celis/AFP/via Getty Images
Sen. Rand Paul, R-Ky., clashed with leading COVID-era infectious disease specialist Dr. Anthony Fauci during a Senate hearing today, bringing renewed attention to ongoing debates over the origins of the coronavirus that caused the pandemic.
Fauci, who led the National Institute of Allergy and Infectious Diseases from 1984 to 2022, has long supported the theory that the virus jumped from animals to humans.
Paul and the Trump administration say the virus leaked from a Chinese lab, either accidentally or intentionally. In 2025, the Trump administration removed some government websites that provided information about COVID-19 and replaced them with a page called “LAB LEAK: The True Origins of COVID-19,” dedicated to the controversial theory.
The laboratory in question, the Wuhan Institute of Virology, is located in the city where the first cases of COVID were recorded.
What does the evidence show?
Supporters of what is now known as the “lab leak” theory point out that scientists’ analysis of the virus was based on incomplete data provided by the Chinese government. They also point to the lack of smoking gun in previous analyses: an animal infected with SARS-CoV-2, the virus that causes COVID-19, in a market in Wuhan, China.
Some US intelligence agencies have also expressed low to moderate confidence in the accidental lab leak theory.
But virologists studying the origins of the pandemic are much less divided than the US intelligence community. They say that there are “very convincing” data and “overwhelming evidence“pointing to an animal origin.
in a report issued in June 2025the World Health Organization stated: “the weight of available evidence… suggests a zoonotic spillover… either directly from bats or through an intermediate host.”
That conclusion was based on three years of research by the 27 members of the WHO Scientific Advisory Group for the Origins of New Pathogens.
NPR reporting has supported that theory.
TO 2024 study in peer-reviewed journal Cell found multiple lines of evidence showing that the virus spread from wild animals to humans.
The study’s authors, a team of scientists that includes notable names such as Michael Worobey and Angela Rasmussen, say the analysis shows with unprecedented granularity that wildlife susceptible to the coronavirus and the SARS-CoV-2 virus were mixing, along with humans, in a very specific part of the wet market in Wuhan.
In two large, peer-reviewed studies published in the magazine Science In 2022, researchers looked at the distribution of the first known cases and found that they formed a target centered on the wet market. If the outbreak had started in the lab, researchers maintain that the cases would have spread from there.
Worobey, an evolutionary biologist who worked on the Science and Cell articles and was at the forefront of research into the origins of the pandemic, spoke with NPR in 2022 about the data.
“It’s absurd how strong the geographic association is [to the market]”he told NPR.
Worobey said the likelihood of a coincidence (in which the virus did come from a laboratory, even though the first cluster of COVID-19 cases occurred in the market: it was “1 in 10,000.”
“The evidence is among the best we have for any emerging virus,” he said. “It is important to note that we have not found a virus related to the intermediate host. But we have a lot of other evidence.”
Preparing for the future
Many scientists still express the need to keep an open mind if new information emerges about the origins of the pandemic.
In the WHO’s 2025 report, the authors point to continued uncertainty about the origins of the pandemic. They wrote that much of the information needed to evaluate the lab leak theory had not been made available to them.
“While a zoonotic origin with spread from animals to humans is currently considered to be the hypothesis best supported by available scientific data, until requests for more information are met or more scientific data become available, the origins of SARS-CoV-2 and how it entered the human population will remain inconclusive,” the report states.
WHO Director-General Tedros Adhanom Ghebreyesus offered this perspective: “As things stand, all hypotheses must remain on the table, including zoonotic spills and laboratory leaks. We continue to appeal to China and any other country that has information on the origins of COVID-19 to share that information openly, in the interest of protecting the world from future pandemics.”
Many members of the scientific community have echoed that call for a forward-looking perspective.
“In my opinion, it is important to continue investigating this question with an open mind while taking proactive measures to minimize the risks of future zoonotic and research-related outbreaks,” said the evolutionary virologist. Jesse Bloom he wrote in an email to NPR.
Some scientists, including Felicia Goodrum, a virologist at Dartmouth College, worry that Senator Paul’s continued focus on the origins of the pandemic, particularly Fauci’s personal notes, could erode public trust in the research.
She believes the goal is to “sow distrust in science and scientists,” Goodrum told NPR Monday from the American Society of Virology meeting in Minneapolis.
She says many virologists are concerned that funding cuts and ongoing tension over the pandemic’s origins are already hampering research focused on preventing the next pandemic.
“We’re less safe. We’re less prepared for a pandemic right now than we were in 2019,” Goodrum says. “And this is terrifying for all of us.”
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