Covid-19 Cases Surge in 460 Counties Sturgis Riders Hailed From

It’s been just over a month since hundreds of thousands of largely unmasked motorcycle riders descended on the small town of Sturgis, S.D., raising fears the event would become a “superspreader” of the coronavirus.

Now, new testing numbers combined with cellphone location data show those fears may have been well-founded.

More than 460 counties nationwide where bikers originated from and Covid-19 cases were trending downward before the rally have shown increases in the virus, a Bloomberg Industry Group data analysis shows.

More than two-dozen counties in South Dakota, Minnesota, Iowa, and Texas flipped in such a manner, while significant numbers ...