Sensitive studies in China were intended to pinpoint the source of the pandemic virus.
An expert team convened by the World Health Organization met Chinese researchers in Wuhan in February 2020 to review when and how SARS-CoV-2 might have emerged.
Researchers are undertaking some work to pin down a timeline of the virus’s initial spread. This includes efforts to trap bats in regions bordering China in search of viruses closely related to SARS-CoV-2; experimental studies to help narrow down which animals are susceptible to the virus and could be hosts; and testing of archived wastewater and blood samples collected around the world in late 2019 and early 2020.
That July, the WHO sent a circular to member states outlining how it planned to advance origins studies. Proposed steps included assessing wild-animal markets in and around Wuhan and the farms that supplied those markets, as well as audits of labs in the area where the first cases were identified.
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