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The long-awaited report from the World Health Organization (WHO) on the origin of covid-19, published after 28 days of field work by experts in Wuhan, presents four possible theories about the appearance of the coronavirus.
The long-awaited report of the World Health Organization (WHO) on the origin of Covid-19, published after 28 days of field work by experts in Wuhan (China), presents four possible theories about the appearance of the SARS-CoV-2 coronavirus in humans, without completely ruling out any.
However, el The report clarifies that some of the theories are more probable than others, highlighting that it is necessary to continue investigating all of them.
Most likely: an intermediate animal
The report considers it "very likely" that the coronavirus that causes covid-19 reached humans from an animal that has very similar coronaviruses (perhaps a bat or a pangolin) but not directly, but through one or several intermediate animals. .
Although the DNA of SARS-CoV-2 is 96% similar to another coronavirus detected in the horseshoe bat, experts consider that the evolutionary distance between the two viruses is "several decades", suggesting a "missing link." ", possibly variations formed in other animals before man.
Contrary to this theory is the fact that no evidence of SARS-CoV-2 has been found in many of China's farm-raised domestic and wild animals.
The least likely hypothesis: a laboratory accident
The report did not consider the possibility of a deliberate release of the coronavirus, already previously ruled out by other experts after analyzing the SARS-CoV-2 genome.
An involuntary release in a laboratory could be plausible, since "although they are rare, accidents do occur and several laboratories around the world work with coronaviruses," the study notes.
The report indicates that the bat coronavirus mentioned, the closest to SARS-CoV-2, was studied at the Wuhan Institute of Virology and that the cities' disease control center moved on December 2, 2019. , a time when laboratory work can be disrupted.
However, the report notes that the three Wuhan laboratories studying coronaviruses had high levels of biosafety, that no incidents were reported at the December 2 move, and that no genome in them was identical to SARS-CoV-2.
All of this makes the theory of the origin of the pandemic in a laboratory "highly improbable," the report concludes.
