The China-WHO Joint Expert Group on Novel Coronavirus Traceability held a press conference on September 9 to report the joint work on global traceability to China.
An international expert team from WHO arrived in Wuhan on January 14 to form a joint expert group with Chinese experts, which is divided into three groups: epidemiology, molecular traceability and animal and environment, to jointly carry out the global traceability work in China.
The joint expert group has jointly studied a large number of epidemic related data and materials, visited 9 institutions including Yinyintan Hospital, and had extensive exchanges with medical personnel, laboratory personnel, scientific researchers, market management personnel and business owners. The results of the joint research have been basically formed.
The available evidence is insufficient
Bats and pangolins are direct ancestors of the novel coronavirus
Coronaviruses with novel coronavirus gene sequences were found in bats and pangolins, but the similarity was not enough to make it a direct ancestor of novel coronavirus.
Animals such as minks and cats are highly susceptible to novel coronavirus, suggesting that bats, pangolins, or weasels, cats, and other species may be potential natural hosts.
How can novel coronavirus be introduced into South China seafood market
Environmental detection after the closure of the South China seafood market generally found that novel coronavirus pollution, especially aquatic products stalls, South China market may be introduced through infected people, contaminated cold chain products, animal products and other ways, but it is not yet confirmed.
No novel coronavirus was found in bats in Hubei Province and a large number of domestic and poultry and wild animals sampled and monitored in China. No evidence of the circulation of novel coronavirus in domestic and poultry and wild animals before and after the outbreak of the epidemic was found.
In December 2019, a certain scale transmission of novel coronavirus occurred in Wuhan population, with most cases concentrated in the second half of the month.
South China seafood market is one of the outbreak points of the new crown epidemic, and it is also a key place that attracted the attention of the disease control department in the early stage of the epidemic. However, the search and analysis of early cases showed that there were cases in the South China seafood market at the same time, there were cases in other places in Wuhan.
Novel coronavirus is “highly unlikely” to have been introduced to humans in the lab
Joint group of experts on will be coronavirus spread from natural host directly and through the cold-chain food, intermediate host, laboratory and other four kinds of bringing people approach the possibility of a scientific evaluation (evaluation conclusions are classified as “highly unlikely”, “impossible”, “may”, “more likely”, “very likely” five level), that will be coronavirus “probably” is the intermediate host is introduced into the crowd, “may” is spread directly or through the cold-chain food is introduced into the crowd, “highly unlikely” is through the laboratory is introduced into the crowd.