The city says there's no need to worry about the concrete falling off the underside of Lake Shore Drive.
On Monday, chunks of the overpass crashed on to lower Lake Shore Drive, just south of Navy Pier. One woman walking on the sidewalk was hurt.
This is the second time in the past couple weeks that crews have had to clean up fallen concrete.
As the deadly epidemic spiraled out of control several weeks ago, a young specialist in infectious disease control working at the Illinois Department of Public Health volunteered to fly to the front line of the fight.