"What kind of ventilation systems do they have? The last check-in we had with them, in their Olympic Village apartments, there wasn't the kind of adequate ventilation that would substantially reduce the spread of the virus," said Michael Osterholm, an infectious disease expert at the University of Minnesota... "What about the workers, the volunteers, the bus drivers exposed for 14 to 16 hours a day who are going into the village and then going back home to their families?" said Sparrow, who helped advise the WNBA through the pandemic... In the two to four weeks it would take for a COVID-19 surge to be detected as the result of the Olympics, a new collection of international delegations will arrive for the Paralympics. “My mind boggles when I think about, 'What are the risks here?'" said Lisa Brosseau, a bioaerosol scientist and research consultant.