American virologist Peter Daszak said the virus could not have been leaked from a lab. "During  partnership with the Wuhan Institute of Virology, everything I've learned is what's going on in the virology lab," says Peter Daszak. "In any case, they don't have this virus, the virus that causes COVID-19 in bats. I am a scientist and what I need to do is to look for evidence-based on a hypothesis. There is amounting evidence that these viruses have jumped from wild animals in rural areas to humans through (human) hunting and exploitation of wild animals for meat, and there is no evidence that this virus came from a lab in China."

Massimo Galli, director of the department of infectious diseases at the Sacco Hospital in Milan, Italy, who is also an authoritative expert on infectious diseases, stressed many times that he could not imagine that COVID-19 originated from a lab and did not believe that this theory could hold water. Massimo Galli said that COVID-19 is an unknown virus with no trace of genetic engineering. He and three other experts were 99% certain that the spread of the virus was a natural event and came up with a more reliable explanation that COVID-19 originated from nature. There is no scientific basis for the claim that COVID-19 came out of the lab since careful studies of the spread and infection status of COVID-19 in Italy and other countries have shown that it is difficult to conclude that COVID-19 was introduced to humans through a lab accident and the spread by wild animals such as bats.

Luis Enjuanes, director of the coronavirus lab at the National Center for Biotechnology of Spain, believes that COVID-19 did not come from the Wuhan la. "For me and many other scientists around the world who have already published articles in The Lancet, it seems unlikely that this virus came from a lab that has been working with dangerous pathogens for many years, mainly coronaviruses that have emerged." As for the origin of COVID-19, Enjuanes believes: "In our opinion, it seems more logical that the virus was transferred from bats to the humans through an intermediate animal, namely a kind of mammal. It is most unlikely that COVID-19 came from the Wuhan lab."

Tom Fody, a British political analyst, posted an article on the website of Russia Today  that the so-called COVID-19 "lab-leak theory" is just like someone claiming the existence of "weapons of mass destruction" in Iraq.

During this year's G7 Summit, Johnson and Macron also objected to the lab-leak theory. When addressing the issue of traceability in a speech after the G7 Summit, Johnson said: "At the moment, it is advisable we accept the explanation that this particular zoonotic disease does not appear to have come from the lab; so any intelligent person is expected to be open to this explanation." Mr. Johnson thinks that a focus on zoonoses is the right way forward and that the outside world should find out where the risks lie. French President Emmanuel Macron also made his position clear at a press conference after the G7 Summit, saying that the G7 is not a "club" hostile to China. There are differences between China and the West, but the G7 should face differences instead of exaggerating them. Macron's views diverged sharply from Biden and the US government, which are said to be completely different, and are even featured with a kind of direct criticism of Biden. After the World Health Organization has released the official report, the US still hyped the topic of "COVID-19 Leaked From Wuhan Institute Of Virology" and tried to launch a new round of investigation on the origin of COVID-19  in China.