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A member of Illinois Governor JB Pritzker’s staff has tested positive for COVID-19.

The governor’s office released a statement Tuesday and said the staff member was tested last week during the office’s weekly tested and was negative.

The staff member then began experiencing symptoms and tested Monday. That test was positive.

“The staffer attended events with the governor on Wednesday in Chicago, Thursday in Marion and Sunday in Marseilles. Both the governor and the staffer were wearing masks during the entirety of their interactions,” according to the statement.

Chicago Mayor Lori Lightfoot was at the Wednesday event. Her office released a statement Tuesday that read:

We were just informed by the Governor’s Office that one of their staff members, who had been at the same event as the Mayor last week, has tested positive for COVID-19. The Mayor was not in close contact with this individual, and was socially distanced and wearing a mask for the majority of the event. The Mayor is tested regularly for COVID-19 and received a negative test result as recently as this morning. We have worked with both IDPH and CDPH to follow the necessary health guidance and protocols to ensure that any of our staffers who had been in close contact with the individual will quarantine for 14 days.

Pritzker and “all other close contacts” will self-isolate for 14 days.

“In addition, all staff who currently report to the office are being tested and must test negative before reporting back to the office. Yesterday, all samples that were ran to test for COVID-19 came back negative,” the statement said.

The staffer has been interviewed and a contact tracing effort is underway, the statement said.

This is the second time a member of Pritzker’s staff has tested positive. In May, a senior staff member tested positive for the virus. The staff member was asymptomatic.