Some health experts had concerns about users’ safety inside the bubbles. “There is no evidence about the efficacy — or lack thereof — of these bubbles from an infectious disease transmission point of view,” said Dr. Sandro Galea, dean of the Boston University School of Public Health. He said that virus transmission control depends on good air circulation and filtration. “So, in theory, if air filtration is good, protective barriers can helpfully augment and reduce risk of transmission, but I would be hesitant to attend a concert in a bubble at the moment unless this has been assessed further,” he said.
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