The Boys & Girls Club of Rochester has temporarily closed after one of two staff members showing symptoms of COVID-19 tested positive for the virus, a statement on the club's website said.

"(Monday), we learned that a Club staff member tested positive for COVID-19," the statement said. "There is a possibility that members were exposed to this individual in the two weeks prior to the date of diagnosis."

Club officials remain in contact with the infected staff member, who is in quarantine.

Club officials say they believe the staff member contracted the coronavirus outside the club environment, but was present at the club and not exhibiting symptoms during the week of June 29. Infected people can be symptom-free but still be contagious and transmit the virus to others, public health officials say.

Officials believe the risk of exposure to others is limited, but club members are suspected to have been exposed, as members' parents were being contacted by the club and Olmsted County Public Health to advise on the next steps to take. The statement did not say how many children were believed to be exposed.

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"Because of the safety precautions at Club related to physical distancing, the close contacts considered to be at-risk of exposure are limited to the closed-group working with this specific staff member," club officials said.

In an earlier statement, the club said it was awaiting the results of COVID-19 tests on the two staff members and was working with public health officials to support contact-tracing efforts. Officials did not say whether the second person showing symptoms of COVID-19 also tested positive.

As a precautionary measure, the club closed on Monday and will remain closed today, but will re-open Wednesday to resume the club's summer program schedule "on the advice of Olmsted County Public Health."

The Rochester club serves 500 children annually, said Becca Stiles-Nogosek, the club's director of resource development. The organization closed in March in response to state-mandated closure orders issued by Gov. Tim Walz to slow the spread of the virus. The club had re-opened in June.