WHO emergency committee session comes with their colleagues seeking the origins of the virus on a long-delayed mission to the pandemic ground zero in Wuhan.
Much remains unknown about its origins and China has been sensitive about suspicion of a cover-up that delayed its initial response and allowed the virus to spread.
There are also mounting fears that travel plans for hundreds of millions of people for the Lunar New Year next month may be ruined as virus controls tighten.
The court said Zhang Zhan had spread "false remarks" online, according to one of her lawyers Zhang Keke, but the prosecution did not fully divulge its evidence in court.
“Increased hospital traffic and symptom search data in Wuhan preceded the documented start of the SARS-CoV-2 pandemic in December 2019, the research said.