BEIJING • The director of a maximum-security laboratory in China's coronavirus ground-zero city of Wuhan has rejected claims that it could be the source of the outbreak, calling it "impossible".
Beijing has come under increasing pressure over transparency in its handling of the pandemic, with the United States probing whether the virus actually originated in a virology institute with a high-security biosafety laboratory.
Chinese scientists have said the virus likely jumped from an animal to humans in a market that sold wildlife.
But the existence of the facility has fuelled conspiracy theories that the germ spread from the Wuhan Institute of Virology, specifically its P4 laboratory which is equipped to handle dangerous viruses.
In an interview with state media published on Saturday, Professor Yuan Zhiming, director of the laboratory, said that "there's no way this virus came from us".
None of his staff had been infected, he told English-language state broadcaster CGTN, adding that the "whole institute is carrying out research in different areas related to the coronavirus".
The institute had already dismissed the theory in February, saying that it had shared information about the pathogen with the World Health Organisation (WHO) in early January.
But last week, the US brought the rumours into the mainstream, with Secretary of State Mike Pompeo saying US officials are doing a "full investigation" into how the virus "got out into the world".
When asked if the research suggested the virus could have come from the institute, Prof Yuan said: "I know it's impossible.
"As people who carry out viral studies, we clearly know what kind of research is going on at the institute and how the institute manages viruses and samples."
He said that because the P4 laboratory is in Wuhan, "people can't help but make associations", but that some media outlets are "deliberately trying to mislead people".
Reports in both the Washington Post and Fox News have quoted anonymous sources who voiced concern that the virus may have come - accidentally - from the facility.
Prof Yuan said the reports were "entirely based on speculation", without "evidence or knowledge".
The authorities in Wuhan initially tried to cover up the outbreak and there have been questions about the official tally of infections, with the government repeatedly changing its counting criteria at the peak of the outbreak.
Last week, the authorities in the city admitted mistakes in counting its death toll and abruptly raised the figure by 50 per cent.
The WHO has said that the revision in death toll was "an attempt to leave no case undocumented", after medical services in Wuhan were overwhelmed at the start of the outbreak.
AGENCE FRANCE-PRESSE, REUTERS