They are bringing together hundreds, sometimes thousands, of people just as the country is reopening after lengthy lockdowns to stop the spread of COVID-19, the disease caused by the coronavirus.
Health experts say the close proximity of participants, running and yelling or chanting, may increase transmission because people emit more respiratory droplets under these conditions.
"These are large numbers of people getting together closely for prolonged periods of time and often cheering and shouting.
So they're exhaling with vigor.
So we know that people without symptoms can spread this virus and it's possible that, in that circumstance, the COVID virus could be spread to others," said Dr. William Schaffner, an infectious disease expert at Vanderbilt University Medical Center.
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