Covid-19 was far more widespread initially than earlier estimated: Report

There were thousands of undetected early cases of Covid-19 at the beginning of this year, according to a study which found that the disease was far more widespread in Wuhan, China, and Seattle in the US weeks ahead of lockdown measures in each city.

Researchers from The University of Texas (UT) at Austin in the US also concluded that the first case of Covid-19 in Seattle may have arrived as far back as Christmas or New Year's Day.

The study, published in the journal EClinicalMedicine, also found that about a third of the estimated undiagnosed cases in the US were among children.

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