Covid Superspreader Risk Is Linked to Restaurants, Gyms, Hotels

The reopening of restaurants, gyms and hotels carries the highest danger of spreading Covid-19, according to a study that used mobile phone data from 98 million people to model the risks of infection at different locations.

Researchers at Stanford University and Northwestern University used data collected between March and May in cities across the U.S. to map the movement of people. They looked at where they went, how long they stayed, how many others were there and what neighborhoods they were visiting from. They then combined that information with data on the number of cases and how the virus spreads...