Bikers From at Least 39 States Tracked to Rally With Few Masks

Two days after the 80th annual motorcycle rally in Sturgis, S.D., came to an end, health officials across the country are watching to see if attendees at the largest U.S. mass gathering since March brought home Covid-19 as an unwanted souvenir.

Cell phone data gathered by research firm Safegraph shows that visitors, many eschewing the use of protective masks, hailed from at least 39 states and 680 counties on the first day of the 10-day event.

Thousands arrived from states like Texas, Florida and other regions throughout the Sun Belt that have seen record-high virus levels in recent weeks. The ...