The resident is doing well, according to the city's health director.

MARLBOROUGH – A Marlborough resident has a presumed positive test for the coronavirus, but that person has no known contacts in the Marlborough Public Schools or other schools in the city, Marlborough officials said at a press conference Wednesday afternoon.

The Marlborough Board of Health was informed of the presumptive positive test late Tuesday night, said John Garside, the city’s public health director.

“That person is doing well,” said Garside.

Garside and Mayor Arthur Vigeant are unsure if the person attended the recent Biogen leadership conference in Boston. Seventy coronavirus infections in Massachusetts have been linked to the leadership conference.

Presumptive means the test was positive as performed by the Massachusetts Department of Public Health, but has yet to be confirmed by the Centers for Disease Control. There are 91 presumptive cases of coronavirus in Massachusetts as of Wednesday afternoon.

“We have one presumptive positive in the city, and as testing takes place, we’re going to see more of that,” said Vigeant.

The mayor and Patricia Moran, public health nurse, encouraged residents to use common sense and keep children home from school if they are sick.

“Stay away from events if you’re not feeling well,” said Vigeant.

Event cancellations will be case-specific, said Garside.

Sanitation efforts, including cleaning of railings and other surfaces, have been ramped up at City Hall, the schools, the senior center and other city buildings.

“This is something we’re going to have to live with for a little while,” said Vigeant.

The Advanced Math and Science Academy charter school, on Forest Street, will be closed Thursday and Friday for a complete deep cleaning of school buildings due to ongoing coronavirus concerns.

School officials said there are no known diagnoses or exposures at this point.

Vigeant has been in touch with officials at the New England Sports Center and the Apex Center – two heavily visited facilities in the city. Both are also increasing sanitation efforts.

City hotels have seen a significant drop in occupancy since the outset of the coronavirus outbreak, said Vigeant.

Jeff Malachowski can be reached at 508-490-7466 or jmalachowski@wickedlocal.com. Follow him on Twitter @JmalachowskiMW.