SHANGHAI - A strain of COVID-19 that has infected more than 300 people in Beijing since early June could have originated in South or Southeast Asia, according to a study by Harvard University researchers.
The Harvard study, published on the preprint website medRxiv.org on Tuesday and which has still to be peer-reviewed, took three of the SARS-CoV-2 genome sequences collected in Beijing last month and compared them to 7,643 samples worldwide. They were also similar to a small number of infections seen in China in March, suggesting the strain could have appeared first in China and then returned to the country three months later, the authors said.
The outbreak traced to Beijing's huge Xinfadi wholesale market on June 11 had infected 329 people by the end of Wednesday.
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