WHO investigators in Wuhan, China, have concluded that a coronavirus lab leak is 'extremely unlikely' as the origin of COVID-19.
This long-awaited WHO mission to trace SARS-CoV-2 origins faced delays due to China's initial reluctance. After 12 days of fieldwork in Wuhan, a joint team of 10 international scientists and 5 WHO experts released their findings.
While many questions persist, the report firmly rules out a leak from Wuhan's P4 laboratory as 'extremely unlikely.' This assessment draws from scientific literature reviews, interviews with local researchers, and site visits, including the Wuhan Institute of Virology. It aligns with global geneticists' consensus: no evidence of genetic manipulation in SARS-CoV-2.
The investigation bolsters the hypothesis of zoonotic transmission via an unidentified intermediate animal host, likely infected by reservoir species such as horseshoe bats.
Despite testing over 11,000 animals in China—all negative for SARS-CoV-2—further targeted research is essential, as noted by WHO team lead Ben Embarek.
New insights emerged from hospital doctor interviews and the Huanan market visit, which sold seafood and live animals. Epidemiological mapping revealed early December cases unlinked to the market, suggesting it amplified rather than originated the outbreak.
The WHO now prioritizes studies on animals and frozen products transported to Wuhan as the most plausible transmission pathway.
