The World Health Organization (WHO) have been refused by China to investigate Covid-19 log studies at the Institute of Virology in Wuhan.
It is believed that Beijing have deliberately delayed and covered up the seriousness of the virus before it hit the rest of the world, and have been criticised for being so secretive.
Dr Gauden Galea said a WHO representative told Sky News, “We know that some national investigation is happening but at this stage we have not been invited to join.
“WHO is making requests of the health commission and of the authorities.
“The origins of virus are very important, the animal-human interface is extremely important and needs to be studied.
“The priority is we need to know as much as possible to prevent the reoccurrence.”
Chinese authorities claimed from 2 to 16 January there were just 41 cases of coronavirus in Wuhan.
But Dr Galea said, “Is that a matter of difficulty in finding were they getting their act together, is it a question of definition? I cannot speculate.
“But it would have been during that period obviously some growth would have been happening.
“It is unlikely that with an epidemic of this nature that it stays at 41 exactly.
“But yes, were there more cases? That is something that China will have to answer for.”
Sky News was told the WHO were not allowed to probe logs from two laboratories at Wuhan, and Wuhan CDC.
Dr Galea said, “From all available evidence, WHO colleagues in our three-level system are convinced that the origins are in Wuhan and that it is a naturally occurring, not a manufactured, virus.”
He added, the lab logs “would need to be part of any full report, any full look at the story of the origins.”
The US President Donald Trump said during a White House press briefing that he has seen evidence that coronavirus did start at a Wuhan laboratory.