Post by Admin on May 25, 2021 20:05:33 GMT
A newly public U.S. intelligence report is raising new questions about the idea that the novel coronavirus, SARS-CoV-2, escaped from a lab.
According to the Wall Street Journal, the report states that three employees of the Wuhan Institute of Virology sought hospital care in November 2019, approximately when SARS-CoV-2 is thought to have started circulating in the Chinese city. The Institute works with coronaviruses found in animal populations.
However, it's unclear how sick the researchers were or what their symptoms were. In the Chinese medical system, it's common to seek entry-level medical care directly from hospitals rather than outpatient clinics, according to the Wall Street Journal, and there is no information on whether the employees were admitted for inpatient care or seen as outpatients.
The new information is likely to increase pressure for more investigations into the origin of the novel coronavirus. Previous work on the genetics of the virus has shown no signs of human tampering: The virus resembles coronaviruses known to circulate in bats or pangolins, with a mutation in the virus's spike protein that enables the virus to more easily invade human cells, helping to enable person-to-person spread. But this mutation is not what computer simulations predicted would have made the virus more transmissible. Instead, this genetic fingerprint makes the most likely reason for the pandemic a lucky break for the virus: Random mutation appears to have stumbled upon a sequence that allowed the virus to take off in a new host in a classic case of natural selection, according to a March 2020 paper in the journal Nature Medicine.
"This analysis of coronavirus genome sequences from patients and from various animals suggests that the virus likely arose in an animal host and then may have undergone further changes once it transmitted and circulated in people," Adam Lauring, an associate professor of microbiology, immunology and infectious diseases at the University of Michigan Medical School who was not involved in that research, told Live Science in April 2020.
As the rise of new SARS-CoV-2 variants shows, the virus mutates regularly, and some of those mutations are associated with changes in how effectively it transmits.
The earliest reported outbreak of the virus occurred at the Huanan Wholesale Seafood Market in Wuhan. Initially, some speculated that the virus had jumped from animal to human at the market, because live animals were housed and sold there. However, it soon became clear that the wet market may not have been the original site of that leap: There were early cases of COVID-19 in the city not connected to shoppers at that market, and there have not been any SARS-CoV-2 sequences found in animals from the market. Instead, it seems that the market was simply the site of the first recorded super-spreader event. The World Health Organization (WHO) has said that the most likely origin of the virus was that it spread from bats to another, unknown animal, and then from there to humans.
According to the Wall Street Journal, the report states that three employees of the Wuhan Institute of Virology sought hospital care in November 2019, approximately when SARS-CoV-2 is thought to have started circulating in the Chinese city. The Institute works with coronaviruses found in animal populations.
However, it's unclear how sick the researchers were or what their symptoms were. In the Chinese medical system, it's common to seek entry-level medical care directly from hospitals rather than outpatient clinics, according to the Wall Street Journal, and there is no information on whether the employees were admitted for inpatient care or seen as outpatients.
The new information is likely to increase pressure for more investigations into the origin of the novel coronavirus. Previous work on the genetics of the virus has shown no signs of human tampering: The virus resembles coronaviruses known to circulate in bats or pangolins, with a mutation in the virus's spike protein that enables the virus to more easily invade human cells, helping to enable person-to-person spread. But this mutation is not what computer simulations predicted would have made the virus more transmissible. Instead, this genetic fingerprint makes the most likely reason for the pandemic a lucky break for the virus: Random mutation appears to have stumbled upon a sequence that allowed the virus to take off in a new host in a classic case of natural selection, according to a March 2020 paper in the journal Nature Medicine.
"This analysis of coronavirus genome sequences from patients and from various animals suggests that the virus likely arose in an animal host and then may have undergone further changes once it transmitted and circulated in people," Adam Lauring, an associate professor of microbiology, immunology and infectious diseases at the University of Michigan Medical School who was not involved in that research, told Live Science in April 2020.
As the rise of new SARS-CoV-2 variants shows, the virus mutates regularly, and some of those mutations are associated with changes in how effectively it transmits.
The earliest reported outbreak of the virus occurred at the Huanan Wholesale Seafood Market in Wuhan. Initially, some speculated that the virus had jumped from animal to human at the market, because live animals were housed and sold there. However, it soon became clear that the wet market may not have been the original site of that leap: There were early cases of COVID-19 in the city not connected to shoppers at that market, and there have not been any SARS-CoV-2 sequences found in animals from the market. Instead, it seems that the market was simply the site of the first recorded super-spreader event. The World Health Organization (WHO) has said that the most likely origin of the virus was that it spread from bats to another, unknown animal, and then from there to humans.