Health
Has the epicenter of Covid’s Chinese Huanan market begun? Answers from top WHO scientists
Did Covid-19 emerge from the Wuhan district of China? Maria Van Kerkhove, head epidemiologist of infectious diseases, said in several studies since March 2021 that animal species sold in the Wuhan market in China, which are susceptible to SARS-CoV-2, have been identified. Said it was identified. COVID infection..
According to Kerkhove, the South China market in Wuhan, China certainly plays a “very important role” in this pandemic, and further research is needed to track the animals sold there before the first detected case. She urges her to continue to need it.
However, Carhove said there is still a lot of uncertainty and further research in this area should be welcomed. “More serology is needed in certain populations, to ensure that previously suspected cases will be studied further by November 2019, and perhaps earlier,” she added.
she said SARS-CoV-2 More research is needed to better understand the exposure of the earliest known and even earlier potential cases. “We need data from multiple studies — it’s like a detective job (and I mean this without police reference),” she joked.
Two latest studies suggest for the Wuhan market:
In particular, scientists have published two recent studies that give some clues as to how the Covid-19 virus first appeared. These studies, which are still in the preprint, have not yet been peer-reviewed.
One of the two studies shows that the SARS-CoV-2 virus saw the first outbreak in a large seafood wholesale market in the South China region of Wuhan District, China, but the second study , Indicates that the Covid virus must have originated from two zoonotic diseases.
Read again: Can COVID subvariants cause serious illness?Experts explain severity
What does the study reveal?
The Covid-19 virus may have originated from two zoonotic diseases.
The first studies, still preprinted, show that the Covid-19 virus may have emerged “very likely” from at least two zoonotic events. Analysis of patterns and origins of SARS-CoV-2 genomic diversity Early pandemicThis study reveals that prior to February 2020, SARS-CoV-2 genomic diversity consisted of only two different viral strains, indicated by A and B, without a translocation haplotype. ..
“The new phylogenetic rooting method combined with epidemic simulations shows that these two strains were the result of at least two separate cross-species transmission events,” it shows. The first zoonotic disease was probably associated with the strain B virus and occurred in late November / early December 2019, but strain A may have occurred in the weeks of the first event. “These findings define a narrow window between when SARS-CoV-2 first jumps into humans and when the first case of COVID-19 is reported,” it showed.
Read again: Does the decline in Covid-19 and Omicron cases mark the end of the pandemic?Expert speaks
Study 2: Humans, the obvious epicenter of the Covid-19 pandemic
Another study suggested that the human seafood wholesale market in Wuhan, China, was the source of the Covid-19 pandemic.
Despite strong epidemiological associations and the documented presence of SARS-CoV-2 susceptible animals, it said the role of the human seafood wholesale market in the Covid-19 pandemic remains controversial.
“The combination of spatial and genomic data shows that both of the two early strains of SARS-CoV-2 are clearly associated with the Huanan market. Also, live mammals, including the raigma dog, 2019. Sold in the market later in the year, geospatial analysis within the market shows positive and negative evidence of SARS-CoV-2 for the emergence of SARS-CoV-2 through live wildlife trade. We report the Huanan market as the apparent source of the Covid-19 pandemic. ”
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