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President Joe Biden has been briefed on a classified report from his intelligence community probing the origins of COVID-19, White House officials told ABC News.

As the assessment made its way to Biden’s desk, intelligence agencies were working in tandem to prepare an unclassified summary for public consumption, lipitor warnings officials said.

The delivery of the assessment met the deadline for Biden’s 90-day deeper dig into the virus’ origins, which was launched when the president directed intelligence agencies in May to “redouble their efforts” after prior efforts failed to yield a definitive conclusion.

But with one deadline met, international scientists tasked with studying the virus’ origins warned Wednesday that another crucial window is “closing fast”: the shrinking opportunity for any thorough scientific study to be completed. As time wears on, potential evidence wanes, and tracing back biologic breadcrumbs will yield diminishing returns, said more than ten of the authors of a World Health Organization-led report that is urging action to “fast-track the follow-up scientific work required” for better answers by the WHO.

PHOTO: A worker in a protective suit is seen at the closed seafood market in Wuhan, China, Jan. 10, 2020.

Assessing the intelligence and raw data available this spring, it became apparent to Biden and his top officials that a large cache of information had yet to be fully analyzed, officials told ABC News — including potential evidence that could hold clues to the virus that has now claimed more than four million lives worldwide.

Consensus among top officials in the Biden administration has been that the pandemic originated in one of two ways: The virus emerged from human contact with an infected animal, or from a laboratory accident.

But with no “smoking gun” and limited access to raw data, discussion of the science has played out in a haze of circumstantial evidence.

Following Biden’s call for clarity in May, intelligence agencies have spent the last three months poring over an untapped trove of information, and have amassed classified records and communications, genomic fingerprints of the virus, and early signals as to where and when the virus may have flared up first.

Biden’s August deadline marks zero hour for the next phase of a larger international quest: to trace back the virus in order to hold the responsible parties to account, and to understand its inception in order to prevent the next one.

Any emerging answers, however, come amid a roiling geopolitical debate, as COVID-19’s origins have become a contentious wedge issue at home — while abroad, the Chinese government vehemently denies the virus could have come from one of its labs.

“What the U.S. cares about is not facts and truth, but how to consume and malign China,” Chinese Foreign Ministry Spokesperson Zhao Lijian said Wednesday ahead of the U.S. report, claiming that China had welcomed collaborative research which “laid the foundation for the next-phase global origins tracing work.”

The Chinese government rejected the World Health Organization’s proposed audits of Wuhan’s labs in July, part of the UN agency’s recommended phase two study — saying they could not accept needless “repetitive research” when “clear conclusions” had already been reached.

But there have been no definitive conclusions as to where COVID-19 came from. The joint WHO-led team presented a range of options in their March report, calling a lab leak “extremely unlikely,” but offering pathways for further investigation. Team members have voiced frustration with the lack of cooperation from the Chinese government — echoed in international criticism that politics had stymied science.

Since then, the WHO has become increasingly receptive to the possibility that the virus resulted from a lab leak. In July, WHO Director-General Tedros Adhanom Ghebreyesus acknowledged that ruling out a lab leak theory was “premature” and recommended audits of the Wuhan labs in further studies. China’s subsequent rebuff left the WHO to proceed without them.

PHOTO: President Joe Biden delivers remarks on the situation in Afghanistan, in the Roosevelt Room at the White House in Washington, Aug. 24, 2021.

White House National Security Adviser Jake Sullivan has underscored that the U.S. will continue the “diplomatic spadework” of rallying support for the WHO-led study — while warning that the administration will not accept Beijing’s stonewalling.

“Either they will allow, in a responsible way, investigators in to do the real work of figuring out where [COVID-19] came from, or they will face isolation in the international community,” Sullivan told Fox News in June.

A group of bipartisan lawmakers urged Biden not to let this month’s deadline hamstring a thorough investigation.

“If the 90-day effort you have announced does not yield conclusions in which the United States has a high degree of confidence, we urge you to direct the intelligence community to continue prioritizing this inquiry until such conclusions are possible,” Sens. Mark Warner (D-Virginia) and Marco Rubio (R-Fla.) of the Senate Intelligence Committee and Jim Risch (R-Idaho) and Bob Menendez (D-N.J.) of the Senate Foreign Relations Committee wrote in a late July letter to the president.

Asked about the report’s release, White House Press Secretary Jen Psaki said it would take “several days” for an unclassified and collated version to come together, but that agencies were working “expeditiously to prepare that.”

With no definitive proof of the virus’ origin, scientists and policymakers alike have been left to speculate. Some of the first COVID-19 clusters occurred around Wuhan’s wet markets, where exotic wild fare was sold in close quarters, offering ample opportunity for the virus to jump from animals to humans, as in past epidemics.

No direct animal host for COVID-19 has been identified, and if there is one, it could take years to find, experts say. While environmental samples from the Wuhan markets tested positive, animal samples that were tested did not. Transmission earlier on and within the wider community would suggest the market was not the original source of the pandemic, experts say.

PHOTO: Members of the World Health Organization team investigating the origins of the COVID-19 coronavirus are seen during their visit to the Hubei Center for animal disease control and prevention in Wuhan, China's central Hubei province on Feb. 2, 2021.

In late summer and early autumn of 2019, satellite imagery shared exclusively with ABC showed dramatic spikes in auto traffic around major Wuhan hospitals — suggesting the virus may have been spreading long before the world was alerted. U.S. intelligence officials had already been warning that a contagion was sweeping through the region as far back as late November 2019, changing patterns of life and business and posing a threat to the populations, according to sources briefed on the matter.

Proponents of the lab-leak theory point to gain-of-function research conducted at the Wuhan Institute of Virology, a controversial study that amplifies a virus’ potency to understand how to neutralize it better. They also point to concerns over biosafety at the WIV’s facilities, where researchers had worked with bat coronavirus samples 96% similar to SARS-CoV-2 — as well as workers at the lab who were hospitalized with “symptoms consistent with both COVID-19 and common seasonal illnesses” in November 2019.

Advocates of zoonotic origin, however, emphasize that the 4% discrepancy means a world of genetic difference — and WIV lead researcher Shi Zhengli insists that she tested all her workers for COVID-19 antibodies, and all tests came back negative.

Despite pressure to approach the “high degree of confidence” desired by the public and requested in the lawmakers’ July letter, such certainty remains elusive — something presaged by Director of National Intelligence Avril Haines in an interview with Yahoo News earlier this summer.

“We’re hoping to find a smoking gun,” Haines said. “It’s challenging to do that.”

ABC News’ Josh Margolin, Karson Yiu, James Gordon Meek, Eric M. Strauss, Ben Gittleson and Molly Nagle contributed to this report.

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