Coronavirus: pathogen could have been spreading in humans for years, study says
- Virus may have jumped from animal to humans long before the first detection in Wuhan, according to research by an international team of scientists
- Findings significantly reduce the possibility of the virus having a laboratory origin, director of the US National Institute of Health says
Though there could be other possibilities, the scientists said the coronavirus carried a unique mutation that was not found in suspected animal hosts, but was likely to occur during repeated, small-cluster infections in humans.
Dr Francis Collins, director of the US National Institute of Health, who was not involved in the research, said the study suggested a possible scenario in which the coronavirus crossed from animals into humans before it became capable of causing disease in people.
“Then, as a result of gradual evolutionary changes over years or perhaps decades, the virus eventually gained the ability to spread from human to human and cause serious, often life-threatening disease,” he said in an article published on the institute’s website on Thursday.
