https://medicalxpress.com/news/2020-04-exhaled-aerosols-coronavirus-feetand-virus.html

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Their tests found that 70% of swab samples from the hospital floor came up positive for coronavirus, "perhaps because of gravity and air flow causing most virus droplets to float to the ground," the study authors said.

"In addition, as medical staff walk around the ward, the virus can be tracked all over the floor, as indicated by the 100% rate of positivity from the floor in the [hospital] pharmacy, where there were no patients," the researchers said. "Therefore, the soles of medical staff shoes might function as carriers."

Not surprisingly, swabs taken of often-touched surfaces—doorknobs, bed rails, trash cans and computer mice—typically came up positive for coronavirus.

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