COVID-19 highly likely circulated in U.S. in Sept. 2019: Study

A study published on the pre-print platform ChinaXiv, a Chinese open repository for scientific researchers, indicated that COVID-19 had started spreading in the U.S. around September 2019 "with a high confidence probability."

The study, conducted by researchers from the University of Science and Technology of China and the University of Chinese Academy of Sciences, is based on a data and hybrid model-driven method.

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