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Both U.S. political parties are now open to the idea that Covid may have come from a lab in China.

A new House committee investigating the origins of Covid opened its first public hearing yesterday with plenty of political theater. Republicans accused Dr. Anthony Fauci of covering up the virus’s origins, and Democrats criticized those claims as biased and unsubstantiated. But lawmakers displayed bipartisan agreement on one point: The virus really may have come from a laboratory in China.

“Whether it was a lab leak or infection through animals, I think we’ve got to pursue both of those paths if we are ever to get the truth,” Representative Kweisi Mfume, Democrat of Maryland, said.

Such agreement might have been surprising not long ago. From the start of the pandemic, the idea of a lab leak was fraught. Some scientists treated it as an outright conspiracy theory. Many Democratic politicians, journalists and others instead embraced the explanation that the virus jumped from animals to humans.

Now, the F.B.I. and the Energy Department, which employ leading U.S. scientists, say a lab is the likely origin. But they remain uncertain, and four other U.S. intelligence agencies say, with low confidence, that it more likely originated in animals.

Today’s newsletter will explain the debate over the theory and why it matters.

There are actually multiple lab leak theories.

The most plausible is that the virus accidentally leaked from a lab in Wuhan, China, where scientists may have been studying it, and possibly engineered it, for research and medical purposes.

That theory differs from the claim that lab scientists created Covid as a bioweapon or that China intentionally leaked the virus. Neither experts nor U.S. officials take that assertion seriously. “It is an important distinction,” said my colleague Sheryl Gay Stolberg, who covers health policy.

The natural origin theory: Animal-to-human transmission is the predominant origin of viral diseases, including other coronaviruses and bird flus. Many of the first confirmed Covid cases were linked to an animal market in Wuhan, and live mammals there are known to spread viruses.

The lab leak theory: Wuhan is home to an advanced virus-research lab and the Chinese C.D.C. — ties that lend credence to the idea of a lab leak, much as the animal market’s presence does for the natural origin theory. Chinese officials’ apparent destruction of evidence adds to the suspicions of a lab leak. Biological labs around the world also have a history of accidental leaks.

Even many officials and others who lean toward one of the two theories remain uncertain. U.S. officials are divided and acknowledge they are working with imperfect information, largely because China has not allowed an independent investigation within its borders.

For many, determining the cause of a pandemic that has killed nearly seven million people worldwide, including 1.1 million in the U.S., is important regardless of broader implications. Basically, the truth matters for its own sake.

The Wuhan Institute of Virology.Hector Retamal/Agence France-Presse — Getty Images

Learning the origins of Covid could help save lives, too. If the virus came from an animal, then studying and tracking the spread of viruses in nature could be crucial to preventing the next pandemic. If it originated in a lab, then improving the security and safety of virology labs might be more important.

And if both theories seem plausible, that is a case for doing more to prevent animal-to-human transmission and future lab leaks. “Some scientists argue there’s more to be done on both fronts,” said my colleague Benjamin Mueller, who covers health and science.

Some scientists who initially dismissed the lab leak based their views on earlier, incomplete evidence. At first, experts embraced the animal market explanation because some of the first confirmed cases, from December 2019, were linked to the market. But researchers later discovered that the virus may have been spreading weeks earlier, and it is not clear that those cases were linked to the market.

Typical human bias probably played a role in the skepticism, too. “Scientists are human, and science has become a vested-interest industry,” Tim Trevan, founder of the safety consulting company Chrome Biorisk Management, wrote in The Wall Street Journal.

Early in the pandemic, the lab leak theory became politicized when Donald Trump and his allies began promoting it. Many experts took sides, as did much of the public. Some may have also feared that blaming scientists for Covid could have vilified their industry and hurt the funding they rely on. The dynamic is a reminder that experts are also susceptible to biases and self-interest like the rest of us.

Probably not. Pinning down the origin of a virus is inherently difficult. China has made the task harder, blocking outside investigations and refusing to share data on the virus’s spread.

But the investigations, including the House’s, have already spurred discussion and debate about better tracking of animal viruses and improving lab security. Those steps could help save lives even if we never know what really caused the Covid pandemic.

For more: “Assigning blame is not going to bring back seven million people” The hearing showed the difficulty of uncovering conclusive evidence about Covid’s origin.

An armed guard in Dhangri village.Atul Loke for The New York Times

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Matthew Cullen, Lauren Hard, Lauren Jackson, Claire Moses, Ian Prasad Philbrick, Tom Wright-Piersanti and Ashley Wu contributed to The Morning. You can reach the team at [email protected].

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