The risk COVID-19 might have leaked from a Chinese lab shouldn't be dominated out, a former prime Chinese authorities scientist has stated.

Professor George Gao, the previous head of China's Centre for Disease Control (CDC), instructed the BBC Radio 4 podcast Fever: The Hunt for COVID's Origin: "You can always suspect anything. That's science. Don't rule out anything."

This is in distinction to the place of the Chinese authorities, which dismisses any suggestion the virus could have originated in a Wuhan laboratory.

Wuhan - the town the place the virus was first detected - is residence to one among China's prime nationwide laboratories recognized to have spent years finding out coronaviruses.

Professor Gao performed a key function within the pandemic response and efforts to hint the way it began.

The COVID-19 lab leak principle resurfaced earlier this yr in February when the FBI's director said that is the place it "most likely" originated.

But many scientists say the burden of proof suggests {that a} pure origin - the virus spreading from animals to people - is the most certainly state of affairs.

In a report seen by the Wall Street Journal, 4 different US businesses agreed with the FBI and stated a lab leak was probably the results of pure transmission.

Another two businesses stay formally undecided, the Journal added.

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Professor Gao instructed the BBC a proper investigation into the Wuhan Institute of Virology was carried out and "that lab was double-checked by the experts in the field".

He added: "I think their conclusion is that they are following all the protocols. They haven't found (any) wrongdoing."

What has China stated in regards to the 'lab leak'?

"The so-called 'lab leak' is a lie created by anti-China forces. It is politically motivated and has no scientific basis," the Chinese embassy within the UK instructed the BBC.

Earlier this yr, Foreign Ministry spokeswoman Mao Ning stated the involvement of the US intelligence group was proof sufficient of the "politicisation of origin tracing".

"By rehashing the lab-leak theory, the US will not succeed in discrediting China, and instead, it will only hurt its own credibility," Ms Mao stated.

"We urge the US to respect science and facts... stop turning origin tracing into something about politics and intelligence, and stop disrupting social solidarity and origins cooperation," she added.

When did COVID-19 first begin spreading?

According to the UK authorities web site, in December 2019, the World Health Organisation (WHO), was knowledgeable of a cluster of circumstances of pneumonia of unknown trigger detected in Wuhan City, China.

In January 2020, it was introduced {that a} novel coronavirus (SARS-CoV-2) had been recognized from affected person samples.

A month later, the virus was formally named SARS-CoV-2, and the illness attributable to it was named COVID-19.

According to the WHO, an estimated 336.8 million life-years had been misplaced globally due to the pandemic.