As Covid-19 Surges, the Big Unknown Is Where People Are Getting Infected

The U.S. and Europe struggle to identify where coronavirus infections are occurring, making it hard to impose targeted restrictions

Health experts say having a vaccine is just one front in a two-front battle against Covid-19. The other is effective treatments for those who are already sick with the disease. WSJ breaks down the three most promising types in development. Photo Illustration: Jacob Reynolds/WSJ.

Western nations face a big challenge in fighting the Covid-19 pandemic: Ten months into the health crisis, they still know little about where people are catching the virus.

The problem is becoming more acute as new cases are breaking records in the U.S. and Europe and pressure grows on authorities to impose targeted restrictions on places that are spreading the virus, rather than broad confinement measures that are wreaking havoc on the economy.

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