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With low testing rates, how do we estimate the true number of covid-19 cases? A new study uses flu-like illnesses (besides the flu) as a proxy

These illnesses have surged in the US: from March 8-28th they found an estimated 23m more cases than expected from historical data (1/4)
Crucially, these illnesses follow a similar geographic pattern to covid-19 cases (2/4)
This may sound worrying, but if covid-19 has spread more quickly than is commonly thought, it suggests that it has a lower death rate.

Read the analysis by my colleague @DanRosenheck in this week's @TheEconomist (3/4) economist.com/graphic-detail…
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