Against the lab leak theory

There's quite a strong push back against the "the liberal media got the lab leak theory all wrong" in a column in the LA Times, which I got to via Twitter (and not paywalled.)   Some parts:

What’s missing from all this reexamination and soul-searching is a fundamental fact: There is no evidence — not a smidgen — for the claim that COVID-19 originated in a laboratory in China or anywhere else, or that the China lab ever had the virus in its inventory. There’s even less for the wildest version of the claim, which is that the virus was deliberately engineered. There never has been, and there isn’t now.  ...

No one disputes that a lab leak is possible. Viruses have escaped from laboratories in the past, on occasion leading to human infection. But “zoonotic” transfers — that is, from animals to humans — are a much more common and well-documented pathway.

That’s why the virological community believes that it’s vastly more likely that COVID-19 spilled over from an animal host to humans.

That was the conclusion reached in a seminal paper on COVID-19’s origins published in Nature in February 2020 by American, British and Australian virologists. “We do not believe that any type of laboratory-based scenario is plausible,” they wrote.

“We cannot prove that SARS-CoV-2 [the COVID-19 virus] has a natural origin and we cannot prove that its emergence was not the result of a lab leak,” the lead author of the Nature paper, Kristian Andersen of the Scripps Research Institute in La Jolla, told me by email. 

“However, while both scenarios are possible, they are not equally likely,” Andersen said. “Precedence, data, and other evidence strongly favor natural emergence as a highly likely scientific theory for the emergence of SARS-CoV-2, while the lab leak remains a speculative incomplete hypothesis with no credible evidence.”

Coauthor Robert F. Garry of Tulane Medical School told several colleagues during a recent webcast: “Our conclusion that it didn’t leak from the lab is even stronger today than it was when we wrote the paper.”

As the veteran pseudoscience debunker David Gorski sums up the contest between the lab-leak and zoonotic theories, “the likelihood of the two hypotheses is nowhere near close to equal.”

What remains of the lab-leak theory is half-truths, misrepresentations, and tendentious conjecture. ...

 

Let’s take a look at the science underlying the search for COVID’s origins. One important fact is that we may never get a definitive answer. The animal source of the Ebola virus, which was first identified 45 years ago, is still unknown, Maxmen reported in Nature.

Maxmen noted that it took researchers 14 years to trace the 2002-2004 outbreak of severe acute respiratory syndrome, or SARS, to a virus that leapt from bats to humans. ...

 

The lab-leak theory gains from a superficial plausibility — especially to laypersons. The Wuhan lab had a collection of bat viruses, including some that appear to be similar to the coronavirus that causes COVID-19.

But some virologists say they’re not similar enough to mutate into SARS-CoV-2, even through deliberate manipulation, Garry says. “That’s a point that’s not going to resonate very strongly with people who haven’t studied viruses for a long, long time.”