The article published on Tuesday in JAMA Internal Medicine probes the threat of airborne infection by taking a close look at passengers who made a 50-minute trip to a Buddhist event in the eastern Chinese city of Ningbo aboard two buses in January, before face masks became routine against the virus.
What is notable is that the sickness infected people in the front and back of the bus, outside the perimeter of 1m to 2m that authorities and experts say infectious droplets can travel.
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