Shanghai — Scientists in China studying the outbreak of disease caused by the new coronavirus say they have found that two main strains of the virus are circulating in humans and causing infections.

The researchers, from Peking University’s School of Life Sciences and the Institut Pasteur of Shanghai under the Chinese Academy of Sciences, cautioned that their study only looked at a limited range of data, and said follow-up studies of larger data sets were needed to better understand the virus’s evolution...

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