It’s unlikely that COVID-19 crossed species lines at a Wuhan, China, wet market that China originally pinpointed as the source of the global pandemic, a study of the disease found.
The study’s authors, Canadian evolutionary biologist Shing Zhan and MIT molecular biologist Yujia Alina Chan, found that “phylogenetic tracking suggests” that the virus “had been imported into the market by humans.”
“Our observations suggest that by the time SARS-CoV-2” — the underlying virus that causes the coronavirus — “was first detected in late 2019, it was already pre-adapted to human transmission,” the authors wrote in the study.
“The sudden appearance of a highly infectious SARS-CoV-2 presents a major cause for concern that should motivate stronger international efforts to identify the source and prevent near future reemergence.”
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